Transgender is also an umbrella term: in addition to including people whose gender identity is the opposite of their assigned sex (trans men and trans women), it may include people who are not exclusively masculine or feminine (people who are genderqueer, e.g. bigender, pangender, genderfluid, or agender).
Chapman holds the record for the fastest recorded pitch speed in MLB history at 105.1 mph (169.1 km/h) as well as the Guinness World Record for fastest baseball pitch for a male.
The fastball is the most common pitch in baseball, and most pitchers have some form of a fastball in their arsenal. Most pitchers throw four-seam fastballs. It is basically a pitch thrown very fast, generally as hard as a given pitcher can throw while maintaining control.