TBH using a bull and a bear for up/down is stupid.

Why not giraffe and mouse or something clearer?

I should note that "124 useful tools" is commentary in the Hacker News title submission here - the point of the linked post is that most of them are not useful so it highlights some of the ones that are.

That aid I've found the bullish-bearish one totally useful myself, it finally helped me remember which was which!