What is the identifier of the murder in shooters?

Good day to all! Played Far Cry 5 and thought what's missing in the sense of impact from your foes? And I realized that it is not enough that the identifier of the murder (have nabalebale us players this thing for the last 10 years). If someone does not understand, I mean oblique crosshair normally bright colors appearing on the main crosshair when the player kills or injures the enemy. So the question is - what is it called?) I just thought to look for a mod for Far Cry 5 with the same crosshairs, and the name of this ID do not know. Thanks in advance!