Hi, I am getting downvotes for this answer:
Very bad idea; my rule-of-thumb is [clarity over brevity](http://37signals.com/svn/posts/3250-clarity-over-brevity-in-variable-and-method-names).
With an acceptable limit of course.
Just think of what another programmer that comes into the code a little after would think (that might very well be you). Better keep [this](http://commadot.com/wp-content/uploads/2009/02/wtf.png) low.
For [this](http://programmers.stackexchange.com/questions/183865/is-it-a-good-idea-to-provide-different-function-signatures-that-do-the-same-thin/183980#183980) quest…