OR LETTERED PINGS.
Having them would greatly improve communication in raids for players without microphones, for example it would be much easier to tell which player needs Drone Alpha's lasers off its back.

The host's ping could be a blue [A],
Player 2's ping could be an orange [B]
Player 3's ping could be a green [C]
and Player 4's ping could be a purple [D]

Perhaps, each letter could be a different geometrical shape to help differentiate them as well (for color blind people, for example).

So, let's say a square, circle, triangle and pentagon.