Tradition and Usage

[U of M Sam]

A couple questions (for "technical" fun):
-Should the foul lines and foul poles be called "fair lines" and "fair poles"?
-Should we should say "zero" instead of "O" when indicating the ball and strike count?
(Zero is a number and O is a letter).

And a curious one from softball:
Why do announcers, coaches, etc. refer to the "pitchers mound" when in fact there is no mound on the softball field?

The english language is fun!
Sam