Once upon a time, in a distant past there was a Lego Blacktron series:
The Lego Blacktron series has a logo/symbol, it's a yellow triangle with small black triangle inside.
Now my question is: about 15/20/25 years ago there was a cartoon or anime series in which one of the faction (bad one I think) wears the same symbol as Blacktron series units, do you know the name of that cartoon?
Maybe this question would better fit the Science Fiction & Fantasy or MovieStack Exchange, as it's more about the tv-series you're looking for than about LEGO, which just reminds you of that symbol.
It absolutely looks like the Triforce of the video game series Zelda. There also was a Zelda cartoon in the late 1980s / early 1990s. To this point, it seems to fit to your memory — but sadly there's no connection to spaceships, so I assume you where thinking of something else.
I found something else: Starcom: The U.S. Space Force. It's an animated series from the 1980s, which totally looks like what you're searching:
