When I start up my computer, for a second, a small black icon pops up in the bottom left corner of my screen, and disappears again. What is it?

It appears as soon as I've logged in, and sometime when finder starts up. I'm wondering if this is a common thing to happen, or some malicious software starting up.
It appears to be square looking, but is only there for a second, so It's hard to see.

Could simply be the cursor appearing briefly before the graphical user interface shows up. Is it on a black backdrop, or on the grey Apple backdrop with the spinning cogwheel?

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