L signaling a good 3

[bballref3966]

You always signal a good 3 if it's your primary in 2-man. This includes L.

Typically if I'm L and the T also marks a 3-point attempt (near intersection of PCAs), I will drop my arm and watch rebounding.

L does not mirror T's touchdown from T's primary, however. Some old timers in my state still do that and it annoys me.

All this is assuming your state follows the NFHS mechanics for 3-pointers.