[Symbiote]

Most languages allow a variable called "i", but it is for the programmer to choose when that is appropriate.

!^ might be useful, if the code implements an algorithm which uses this notation in the literature.

[sorokod]

A hoarder never throws anything away because it "might be useful". That is not a useful criteria for choosing language features.

[Zababa]

I think variables names and infix operators/method names are very different.