What is Form rounds?
How many measured rounds the player's Form score is built from. More rounds = a more trustworthy form estimate; a handful of rounds is flagged as thin.
The form layer shrinks thin-sample players toward the field average, so a low count already pulls the score toward neutral rather than swinging on noise.
OTIS tracks this stat across 15 PGA Tour seasons — see it for every player, or read how the numbers are sourced in the methodology.