diff --git a/CHANGELOG.md b/CHANGELOG.md
index 454e2e8..c120107 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+## [5.19.0](https://github.com/shivam091/unit_measurements/compare/v5.18.0...v5.19.0) - 2025-01-12
+
+### What's new
+
+- Added US Customary units for square foot (`sq_ft`), square mile (`sq_mi`), and square chain (`sq_ch`).
+
+### What's changed
+
+- Changed symbol of units `cb (M)` and `cb (US)` to `metric_cb` and `us_cb` in `length`.
+- Changed symbol of unit `hp (M)` to `metric_hp` in `power`.
+- Changed symbol of unit `cwt (US)` to `us_cwt` in `weight`.
+
+----------
+
 ## [5.18.0](https://github.com/shivam091/unit_measurements/compare/v5.17.0...v5.18.0) - 2023-12-16
 
 ### What's new
diff --git a/Gemfile.lock b/Gemfile.lock
index 5cb657d..c884ec7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    unit_measurements (5.18.0)
+    unit_measurements (5.19.0)
       activesupport (~> 7.0)
 
 GEM
diff --git a/lib/unit_measurements/unit.rb b/lib/unit_measurements/unit.rb
index 8d43cf5..bb55288 100644
--- a/lib/unit_measurements/unit.rb
+++ b/lib/unit_measurements/unit.rb
@@ -202,6 +202,14 @@ def conversion_factor
       ["Q",  %w[quetta],    1e+30]
     ].map(&:freeze).freeze
 
+    # Prefixes for SI binary units and SI decimal units.
+    #
+    # @see SI_BINARY_PREFIXES
+    # @see SI_DECIMAL_PREFIXES
+    # @author {Harshal V. Ladhe}[https://shivam091.github.io/]
+    # @since 5.19.0
+    SI_PREFIXES = SI_BINARY_PREFIXES + SI_DECIMAL_PREFIXES
+
     # Parses tokens and returns a +conversion value+ and the +unit+.
     #
     # This method is used internally to parse the conversion value of the unit
diff --git a/lib/unit_measurements/unit_group_builder.rb b/lib/unit_measurements/unit_group_builder.rb
index 4db0d45..86f5482 100644
--- a/lib/unit_measurements/unit_group_builder.rb
+++ b/lib/unit_measurements/unit_group_builder.rb
@@ -165,7 +165,7 @@ def cache(cache_file)
     def build_si_units(name, value:, add_binary_prefixes:, aliases:)
       si_units = [build_unit(name, value: value, aliases: aliases)]
 
-      si_prefixes = add_binary_prefixes ? (Unit::SI_DECIMAL_PREFIXES + Unit::SI_BINARY_PREFIXES) : Unit::SI_DECIMAL_PREFIXES
+      si_prefixes = add_binary_prefixes ? Unit::SI_PREFIXES : Unit::SI_DECIMAL_PREFIXES
 
       si_prefixes.each do |short_prefix, long_prefix, multiplier|
         si_aliases = long_prefix.product(aliases.to_a).flat_map do |prefix, unit|
diff --git a/lib/unit_measurements/unit_groups/area.rb b/lib/unit_measurements/unit_groups/area.rb
index 8904e85..61bcb03 100644
--- a/lib/unit_measurements/unit_groups/area.rb
+++ b/lib/unit_measurements/unit_groups/area.rb
@@ -34,10 +34,14 @@
     unit "sec", value: "640 ac", aliases: ["sect", "section", "sections"]
     unit "twp", value: "36 sec", aliases: ["survey township", "survey townships"]
 
-    unit "ac (US)", value: "4046.873 m²", aliases: ["acre (US)", "acres (US)"]
+    unit "us_ac", value: "4046.873 m²", aliases: ["us acre", "us acres"]
     unit "ft² (US)", value: "0.09290341161327482 m²", aliases: ["ft^2 (US)", "sq ft (US)", "square foot (US)", "square feet (US)"]
     unit "mi² (US)", value: "2.58999847e+6 m²", aliases: ["mi^2 (US)", "sq mi (US)", "square mile (US)", "square miles (US)"]
     unit "ch² (US)", value: "404.6873 m²", aliases: ["ch^2 (US)", "sq ch (US)", "square chain (US)", "square chains (US)"]
+
+    unit "sq_ft", value: "0.09290341161327482 m²", aliases: ["us square foot", "us square feet"]
+    unit "sq_mi", value: "2.58999847e+6 m²", aliases: ["us square mile", "us square miles"]
+    unit "sq_ch", value: "404.6873 m²", aliases: ["us square chain", "us square chains"]
   end
 
   system :planck_units do
diff --git a/lib/unit_measurements/unit_groups/length.rb b/lib/unit_measurements/unit_groups/length.rb
index b4ac6a1..05b0f41 100644
--- a/lib/unit_measurements/unit_groups/length.rb
+++ b/lib/unit_measurements/unit_groups/length.rb
@@ -11,7 +11,7 @@
     unit "Å", value: "1e-10 m", aliases: ["angstrom", "angstroms", "ångström"]
     unit "μ", value: "1 μm", aliases: ["micron", "microns"]
 
-    unit "cb (M)", value: "185.2 m", aliases: ["CBL. (M)", "cable length (M)"]
+    unit "metric_cb", value: "185.2 m", aliases: ["metric cable length"]
   end
 
   system :imperial do
@@ -25,7 +25,7 @@
     unit "th", value: "1/1000 in", aliases: ["thou", "thousandth of an inch", "mil", "mils"]
     unit "nl", value: "3 nmi", aliases: ["NL", "nleague", "nleagues", "nautical league", "nautical leagues"]
     unit "rd", value: "16 1/2 ft", aliases: ["rod", "rods", "perch", "pole", "lug"]
-    unit "cb", value: "608 ft", aliases: ["CBL.", "cable length"]
+    unit "cb", value: "608 ft", aliases: ["cable length"]
     unit "qr", value: "1/4 yd", aliases: ["quarter", "quarters"]
     unit "bc", value: "1/3 in", aliases: ["b.c.", "barleycorn", "barleycorns"]
 
@@ -41,7 +41,7 @@
     unit "U", value: "1.75 in", aliases: ["RU", "rack unit", "rack units"]
     unit "sft", value: "1200/3937 m", aliases: ["sfoot", "sfeet", "survey-foot", "survey-feet"]
 
-    unit "cb (US)", value: "720 ft", aliases: ["CBL. (US)", "cable length (US)"]
+    unit "us_cb", value: "720 ft", aliases: ["us cable length"]
   end
 
   system :astronomical do
diff --git a/lib/unit_measurements/unit_groups/power.rb b/lib/unit_measurements/unit_groups/power.rb
index 1ddd2f6..cd5c7c8 100644
--- a/lib/unit_measurements/unit_groups/power.rb
+++ b/lib/unit_measurements/unit_groups/power.rb
@@ -10,7 +10,7 @@
 
     unit "p", value: "980.665 W", aliases: ["poncelet", "poncelets"]
 
-    unit "hp (M)", value: "735.49875 W", aliases: ["PS", "metric horsepower"]
+    unit "metric_hp", value: "735.49875 W", aliases: ["PS", "metric horsepower"]
 
     unit "kgf⋅m", value: "9.80665 W", aliases: ["kgf*m", "kilogramme-force meter", "kilogram-force meter"]
     unit "erg/s", value: "1e-7 W", aliases: ["erg per second", "ergs per second"]
diff --git a/lib/unit_measurements/unit_groups/weight.rb b/lib/unit_measurements/unit_groups/weight.rb
index 72f91b7..5aa60a6 100644
--- a/lib/unit_measurements/unit_groups/weight.rb
+++ b/lib/unit_measurements/unit_groups/weight.rb
@@ -37,8 +37,8 @@
 
   system :us_customary do
     unit "tn", value: "2000 lb", aliases: ["ton", "tons", "short ton", "short tons"]
-    unit "us qr", value: "1/4 cwt (US)", aliases: ["us qtr", "us quarter", "us quarters"]
-    unit "cwt (US)", value: "100 lb", aliases: ["hundredweight (US)", "short hundredweight"]
+    unit "us_qr", value: "1/4 us_cwt", aliases: ["us qtr", "us quarter", "us quarters"]
+    unit "us_cwt", value: "100 lb", aliases: ["us hundredweight", "short hundredweight"]
   end
 
   system :gravitational_metric do
diff --git a/lib/unit_measurements/version.rb b/lib/unit_measurements/version.rb
index cdc979f..ec8c945 100644
--- a/lib/unit_measurements/version.rb
+++ b/lib/unit_measurements/version.rb
@@ -4,5 +4,5 @@
 
 module UnitMeasurements
   # Current stable version.
-  VERSION = "5.18.0"
+  VERSION = "5.19.0"
 end
diff --git a/spec/unit_measurements/unit_groups/area_spec.rb b/spec/unit_measurements/unit_groups/area_spec.rb
index 17c06b5..1eda937 100644
--- a/spec/unit_measurements/unit_groups/area_spec.rb
+++ b/spec/unit_measurements/unit_groups/area_spec.rb
@@ -80,8 +80,8 @@
       expect(subject.convert_to("lnk²").quantity).to eq(123.552690733583)
     end
 
-    it "converts to ac (US)" do
-      expect(subject.convert_to("ac (US)").quantity).to eq(0.00123552184612663)
+    it "converts to us_ac" do
+      expect(subject.convert_to("us_ac").quantity).to eq(0.00123552184612663)
     end
 
     it "converts to ft² (US)" do
@@ -99,5 +99,17 @@
     it "converts to Aₚ" do
       expect(subject.convert_to("Aₚ").quantity).to eq(1.91416867654378e+70)
     end
+
+    it "converts to sq_ft" do
+      expect(subject.convert_to("sq_ft").quantity).to eq(0.538193368055556e2)
+    end
+
+    it "converts to sq_mi" do
+      expect(subject.convert_to("sq_mi").quantity).to eq(0.193050307091494e-5)
+    end
+
+    it "converts to sq_ch" do
+      expect(subject.convert_to("sq_ch").quantity).to eq(0.123552184612663e-1)
+    end
   end
 end
diff --git a/spec/unit_measurements/unit_groups/length_spec.rb b/spec/unit_measurements/unit_groups/length_spec.rb
index 6292a80..06bfcfd 100644
--- a/spec/unit_measurements/unit_groups/length_spec.rb
+++ b/spec/unit_measurements/unit_groups/length_spec.rb
@@ -136,12 +136,12 @@
       expect(subject.convert_to("bc").quantity).to eq(590.551181102362)
     end
 
-    it "converts to cb (M)" do
-      expect(subject.convert_to("cb (M)").quantity).to eq(0.0269978401727862)
+    it "converts to metric_cb" do
+      expect(subject.convert_to("metric_cb").quantity).to eq(0.0269978401727862)
     end
 
-    it "converts to cb (US)" do
-      expect(subject.convert_to("cb (US)").quantity).to eq(0.0227836103820356)
+    it "converts to us_cb" do
+      expect(subject.convert_to("us_cb").quantity).to eq(0.0227836103820356)
     end
 
     it "converts to lₚ" do
diff --git a/spec/unit_measurements/unit_groups/power_spec.rb b/spec/unit_measurements/unit_groups/power_spec.rb
index a86c062..d3623fb 100644
--- a/spec/unit_measurements/unit_groups/power_spec.rb
+++ b/spec/unit_measurements/unit_groups/power_spec.rb
@@ -16,8 +16,8 @@
       expect(subject.convert_to("hp").quantity).to eq(0.00670511044797514)
     end
 
-    it "converts to hp (M)" do
-      expect(subject.convert_to("hp (M)").quantity).to eq(0.00679810808651952)
+    it "converts to metric_hp" do
+      expect(subject.convert_to("metric_hp").quantity).to eq(0.00679810808651952)
     end
 
     it "converts to kgf⋅m" do
diff --git a/spec/unit_measurements/unit_groups/weight_spec.rb b/spec/unit_measurements/unit_groups/weight_spec.rb
index c5f0c10..7b7487f 100644
--- a/spec/unit_measurements/unit_groups/weight_spec.rb
+++ b/spec/unit_measurements/unit_groups/weight_spec.rb
@@ -92,16 +92,16 @@
       expect(subject.convert_to("fir").quantity).to eq(0.196841305522212)
     end
 
-    it "converts to us qr" do
-      expect(subject.convert_to("us qr").quantity).to eq(0.440924524369755)
+    it "converts to us_qr" do
+      expect(subject.convert_to("us_qr").quantity).to eq(0.440924524369755)
     end
 
     it "converts to slug" do
       expect(subject.convert_to("slug").quantity).to eq(0.342608829245948)
     end
 
-    it "converts to cwt (US)" do
-      expect(subject.convert_to("cwt (US)").quantity).to eq(0.110231131092439)
+    it "converts to us_cwt" do
+      expect(subject.convert_to("us_cwt").quantity).to eq(0.110231131092439)
     end
 
     it "converts to mₚ" do
diff --git a/units.md b/units.md
index fe2720b..d5f4168 100644
--- a/units.md
+++ b/units.md
@@ -32,7 +32,7 @@ These units are defined in `UnitMeasurements::Length`.
 | 13 | pc | parsec, parsecs |
 | 14 | nl | NL, nleague, nleagues, nautical league, nautical leagues |
 | 15 | rd | rod, rods, perch, pole, lug |
-| 16 | cb | CBL., cable length |
+| 16 | cb | cable length |
 | 17 | ls | light-second, light-seconds |
 | 18 | lh | light-hour, light-hours |
 | 19 | ld | light-day, light-days |
@@ -47,8 +47,8 @@ These units are defined in `UnitMeasurements::Length`.
 | 28 | sft | sfoot, sfeet, survey-foot, survey-feet |
 | 29 | bc | b.c., barleycorn, barleycorns |
 | 30 | lmin | light-minute, light-minutes |
-| 31 | cb (M) | CBL. (M), cable length (M) |
-| 32 | cb (US) | CBL. (US), cable length (US) |
+| 31 | metric_cb | metric cable length |
+| 32 | us_cb | us cable length |
 | 33 | lₚ | planck length, quantum length |
 | 34 | qr | quarter, quarters |
 | 35 | U | RU, rack unit, rack units |
@@ -81,11 +81,11 @@ These units are defined in `UnitMeasurements::Weight`.
 | 19 | hyl | mug, metric slug, metric slugs, hyls |
 | 20 | cwt | hundredweight, long hundredweight, imperial hundredweight |
 | 21 | slug | slugs |
-| 22 | cwt (US) | hundredweight (US), short hundredweight |
+| 22 | us_cwt | us hundredweight, short hundredweight |
 | 23 | mₚ | planck mass, quantum mass |
 | 24 | qr | qtr, quarter, quarters |
 | 25 | fir | firkin, firkins |
-| 26 | us qr | us qtr, us quarter, us quarters |
+| 26 | us_qr | us qtr, us quarter, us quarters |
 
 ## 3. Time or duration
 
@@ -168,7 +168,7 @@ These units are defined in `UnitMeasurements::Area`.
 | 14 | fur² | fur^2, sq fur, square furlong, square furlongs |
 | 15 | rd² | rd^2, sq rd, square rod, square rods |
 | 16 | lnk² | link^2, sq lnk, square link, square links |
-| 17 | ac (US) | acre (US), acres (US) |
+| 17 | us_ac | us acre, us acres |
 | 18 | ft² (US) | ft^2 (US), sq ft (US), square foot (US), square feet (US) |
 | 19 | mi² (US) | mi^2 (US), sq mi (US), square mile (US), square miles (US) |
 | 20 | ch² (US) | ch^2 (US), sq ch (US), square chain (US), square chains (US) |
@@ -176,6 +176,9 @@ These units are defined in `UnitMeasurements::Area`.
 | 22 | dun | ḍn, dunam, dunams |
 | 23 | sec | sect, section, sections |
 | 24 | twp | survey township, survey townships |
+| 25 | sq_ft | us square foot, us square feet |
+| 26 | sq_mi | us square mile, us square miles |
+| 27 | sq_ch | us square chain, us square chains |
 
 ## 9. Volume & capacity
 
@@ -700,7 +703,7 @@ These units are defined in `UnitMeasurements::Power`.
 |:--|:--|:--|
 | _1_ | _W*_ | _watt, watts_ |
 | 2 | p | poncelet, poncelets |
-| 3 | hp (M) | PS, metric horsepower |
+| 3 | metric_hp | PS, metric horsepower |
 | 4 | kgf⋅m | kgf*m, kilogramme-force meter, kilogram-force meter |
 | 5 | cal/s | calorie per second, calories per second |
 | 6 | cal/min | calorie per minute, calories per minute |