WIND UP POSITION
WIND-UP POSITION is one of the two legal pitching positions.
Any reference in these Official Baseball Rules to “he,” “him” or “his” shall be deemed to be a reference to “she,” “her” or “hers,” as the case may be, when the person is a female.
"Legal pitching delivery. There are two legal pitching positions, the Windup Position and the Set Position, and either position may be used at any time." Rule 8.01