The GetUnits() function returns an expression sequence of all unit name and context pairs.

You can restrict the list by describing the options of the units by using the optional arguments.  The opts argument can contain one or more of the following equations.

'context'=symbol

This option specifies the context of returned units.

'dimension'=algebraic

This option specifies the required dimension for the returned units. It must be an expression that can be converted to a product of powers of base dimensions.

'energy'=truefalse

This option specifies whether energy conversions are used to determine the equality of a given dimension.  See Energy Conversions.

This option can be used only with the 'dimension' option.

'name'=symbol

This option specifies that the units listed must have names or symbols that can be represented by the given name or symbol.

$\mathrm{with}\left(\mathrm{Units}\right)\:$

Automatically loading the Units[Simple] subpackage

$\mathrm{nops}\left(\left[\mathrm{GetUnits}\left(\right)\right]\right)$

$599$

$\mathrm{GetUnits}\left('\mathrm{context}'='\mathrm{avoirdupois}'\right)$

${\mathrm{cental}}_{\mathrm{avoirdupois}},{\mathrm{clove}}_{\mathrm{avoirdupois}},{\mathrm{drachm}}_{\mathrm{avoirdupois}},{\mathrm{grain}}_{\mathrm{avoirdupois}},{\mathrm{kip}}_{\mathrm{avoirdupois}},{\mathrm{ounce}}_{\mathrm{avoirdupois}},{\mathrm{pound}}_{\mathrm{avoirdupois}},{\mathrm{quarter}}_{\mathrm{avoirdupois}},{\mathrm{quintal}}_{\mathrm{avoirdupois}},{\mathrm{stone}}_{\mathrm{avoirdupois}},{\mathrm{wey}}_{\mathrm{avoirdupois}}$

$\mathrm{GetUnits}\left('\mathrm{dimension}'='\mathrm{power}'\right)$

${\mathrm{abwatt}}_{\mathrm{EMU}},{\mathrm{donkeypower}}_{\mathrm{standard}},{\mathrm{horsepower}}_{\mathrm{UK}},{\mathrm{horsepower}}_{\mathrm{boiler}},{\mathrm{horsepower}}_{\mathrm{electric}},{\mathrm{horsepower}}_{\mathrm{metric}},{\mathrm{horsepower}}_{\mathrm{water}},{\mathrm{planck\_power}}_{\mathrm{planck}},{\mathrm{poncelet}}_{\mathrm{standard}},{\mathrm{statwatt}}_{\mathrm{ESU}},{\mathrm{ton}}_{\mathrm{refrigeration}},{\mathrm{voltampere}}_{\mathrm{power}},{\mathrm{voltampere\_reactive}}_{\mathrm{power}},{\mathrm{watt}}_{\mathrm{SI}}$

$\mathrm{GetUnits}\left('\mathrm{name}'='\mathrm{cal}'\right)$

${\mathrm{calorie}}_{\mathrm{15degC}},{\mathrm{calorie}}_{\mathrm{20degC}},{\mathrm{calorie}}_{\mathrm{IT}},{\mathrm{calorie}}_{\mathrm{mean}},{\mathrm{calorie}}_{\mathrm{nutrition}},{\mathrm{calorie}}_{\mathrm{thermochemical}}$

$\mathrm{GetUnits}\left('\mathrm{dimension}'='\mathrm{energy}'\,'\mathrm{context}'='\mathrm{SI}'\right)$

${\mathrm{electronvolt}}_{\mathrm{SI}},{\mathrm{joule}}_{\mathrm{SI}}$