Definitions: Barrage

I think we will call it this... this is the most basic type of Chess tactic.

Barrage: An attack on a piece by more pieces than are defending it.

Reinfeld Position#188
White to move

By 1. Qe4 White combines the mating threat Bishop + Queen barrage at h7 with a barrage against the Bishop at d4 by the Queen and Knight.

Barrage is frequently seen as a positional idea on a particular line or against a particular square. Alekhine and Reti both had a type of barrage named after them, known as 'guns'.

Alekhine's Gun (White) and
Reti's Gun (Black)