I started getting into Warhammer 40k recently, and noticed that the Reclaimer symbol looks a lot like the Tau symbol from 40k. I'm not sure if it's a coincidence, but in 40k, the Tau are trying to unite the galaxy under their rule. Sound familiar?
The Reclaimer symbol was originally just the logo from Marathon, Bungie's previous FPS before Halo. 343 changed it in Halo 4 for copyright reasons. The Marathon symbol is even more similar to the Tau Empire symbol than the Reclaimer symbol is, but whether Bungie were inspired by that symbol back in 1994 isn't known.