You can change letters to their greek equivelent by holding Ctrl and pressing g.
Type p then hold Ctrl and hit g.
Also attached is a list of shortcuts.
Iota (i) is used to represent an imaginary number.
I knew I and j where used to represent imaginary numbers, but I didn't know i was called lota.
There you go - learn something new every day.
Just as with PI it is the likeliest letter in English followed immediately by the Ctrl-G combination - in this case i followed by Ctrl-G.
Opps. I lost track of the thread and missed the whole point of the question (and the gist of your previous reply) <sheepish grin>.