Don't know about the electrical units but it is customary for i to refer to the imaginary part of a complex number or sqrt(-1). In my opinion that one should not be changed. Personnally if a variable has the same symbol as a SMath unit I intentionally change the variable name to something else to avoid conflict with internal names. This is even though you can have a variable name with the same name as a unit without conflict. For example SMath will not confuse the variable name ft with the units 'ft (feet).

scooter,

Perhaps some of the units you propose would be good canidates for built-in units, you can create your own units. You can also create a substitue for imaginary i.



As I see it there are three different name formats. One is just the name by itself, the second is preceeded by a single quote and this is supposed to be used for units, the third is subscripted by typing dot. The third convention with out a subscript could be confusing though since you don't see the dot.