Why do you suppose that 2×3=6 is not used either?Why do we avoid x when multiplying in algebra? For example, 5 x 6 = 30 is not used in algebra. Why?
The division symbol ÷ is not used in algebra.
For example, 6 ÷ 2 = 3 is not used in algebra. Why?
I just told someone not to use x in a question; see if you can find that answer, and see why. (I think it's pretty obvious.)
As for ÷, it is sometimes used; probably the main reason it usually is not is to avoid confusion due to the order of operations (or mere unreadability when things get complicated).
Why do you suppose that 2×3=6 is not used either?
In addition to avoiding using [MATH]\times[/MATH] to indicate multiplication, I tend to avoid using: (1) e as a variable except for elasticity, energy, or Euler's number, (2) i except for an index or a root of minus 1, and (3) lower case letters L and O to prevent confusion.