This is a great scale to use when you’ve got a group of people because it’s easy to teach without needing to do calibration: -1 is bad, not meeting expectations, 0 is “not good, but meets expectations”, 1 is “good, better than expectations” and 2 is outstanding.

It’s hard to come up with a nice visual for it though, you just have to use the numbers themselves (or rather ugly emojis)

> It’s hard to come up with a nice visual for it though

Suggestion off the top of my head: down arrow / thumb down; circle / horizontal dash; up arrow / thumb up; star / heart.

The circle / horizontal dash could be ambiguous in isolation but should be clear in context.