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##

Notation of unit objects

A unit object has two parts : a real number and a unit expression (a single
unit or multiplicative combinaison of unit). The two parts are linked by the
character `_` ("underscore"). For example `2_m` for 2 meters.
For composite units, parenthesis must be used, e.g. `1_(m*s)`.

If a prefix is put before the unit then the unit is multiplicated by a power of
10. For example `k` or `K` for kilo (indicate a multiplication by
10^{3}), `D` for deca (indicate a multiplication by 10), `d` for
deci (indicate a multiplication by 10^{-1}) etc...

Input :
`10.5_m`

Output :
`a unit object of value 10.5 meters`

Input :
`10.5_km`

Output :
`a unit object of value 10.5 kilometers`

giac documentation written by Renée De Graeve and Bernard Parisse