LA
Launch angle — vertical angle off the bat (degrees, 0 = level).
What LA means
Sweet spot ≈ 8-32°. Below 0 is a grounder, above 50 is a pop-up. Combined with EV, drives every Statcast hit-quality model.
Also written
launch_angle · launch_angle_avg · avg_launch_angle · avg_la
Source
Statcast