What do you call here?

[JRutledge]

This is why you read the casebook for a ruling, which you are asking for.

Casebook says under 10.3.5 Situation says in the comment section:

The purpose of the rule is to penalize intentional contact with the backboard while the shot or try is involved or placing the hand on the backboard to gain an advantage. A player who strikes either backboard so forcefully it cannot be ignored because it is an attempt to draw the player or means of venting frustration may be assessed a technical foul pursuant to rule 10-3-7.

Peace