Now that's fine. I'm happy with that. Then, one of the people in the class looks at it and mentions that it has more than a passing resemblance to one of the Eldar's signs from Warhammer 40,000. I google it, and sure enough, he's right.
First reaction - Aaaaaaaa. Can I even use my original idea? It's so similar to another symbol that's used popularly in a similar setting. It should be fine, right? It's a different style, and they're both based on an ancient symbol. It's not plagiarism, we're both using something from 2000 years ago that is probably in the public domain by now.
tl;dr: I'm annoyed that it looks like I'm ripping off the Eldar. They're objectively the worst race in 40k as well, which is just rubbing it in.
I foamed at the mouth while the lights winked at me