Nicknames
As with most facets of the sport of baseball, a colorful variety of nicknames is used to describe the curveball pitch. Popular nicknames include "the bender" and "the hook" (both describing the trajectory of the pitch), "'Uncle Charlie," "the yellow hammer," "yakker," and "Public Enemy No. 1."
It is also referred to commonly as "the deuce" or "number two" because catchers have traditionally signaled their pitcher to throw the curveball by showing two fingers.
Read more about this topic: Curveball