If the proper name for %, $, @, and * are sigils, I suspect polysigilant is a more proper term for what you describe, even though it's more of a mouthful than polysignet.

I suggest polytypic.

As to whether it's a good idea to do it, I really prefer my variables to be self-documenting all the way through the code, and it seems an unneccessary shortcut. If I did it, it probably would lead to confusion down the road.

Update: I'm not able to come up with the origin of the word sigil, but I first saw it in Damian Conway's Exegesis 2, and I know the term is used by gnat and japhy. 

___
-DA
> perl -MPOSIX -e'$ENV{TZ}="US/Eastern";print ctime(10**9)'
Sat Sep  8 21:46:40 2001

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In reply to sigil by da
in thread Polysignant variables by scott

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