Offspeed
Vulcan Change (Split-Change)
Named for the Star Trek hand sign. You wedge the ball between your middle and ring fingers to make a 'V,' which kills spin and makes the ball tumble and drop. It comes in slow off fastball arm speed and acts a lot like a splitter.
The grip
Wedge the ball deep between the middle and ring fingers so it forms a 'V' (the Star Trek Vulcan salute), rather than between the index and middle fingers as a forkball does. The pitch traces to reliever Joe Nelson.
What it does
Thrown with fastball arm speed while pronating the hand (thumb down) to generate downward break; the wide-finger wedge lowers spin, giving it more tumble and drop than a circle change and a look close to a split-finger.
What it really is
A split-change relative to the changeup family that behaves like a split-finger; named for the V-shaped Vulcan-salute grip, with the ball seated between the middle and ring fingers instead of the splitter's index-and-middle placement.
Who throws itJoe Nelson (associated with originating and popularizing the grip).
Basic file
This pitch has a sourced one-line grip and movement and an honest explanation — not yet a filed specimen with authored grip geometry and a full craft chapter. A fuller breakdown is coming. Sourced, not corrected.