Some kind of light? Reflector? Any ideas?
Metal looking inside triangle with round corners, red transparent same triangle with round corners shape outside like you would see on a bike, back has screws and a circle where something could fit inside for a battery or something?
https://imgur.com/TCLtSme
https://imgur.com/Unl4Ph0
https://imgur.com/qzRwkum
https://imgur.com/hzo9nO2
i'm not able to see what you posted
https://www.reddit.com/r/whatisthisthing/comments/18g5x8s/metal_looking_inside_red_transparent_triangle/
Yeah, some sort of bike safety light looks right.
Tried reverse image searching, but couldn't find anything.
Images for reference:
https://imgur.com/TCLtSme
https://imgur.com/Unl4Ph0
https://imgur.com/qzRwkum
https://imgur.com/hzo9nO2
Does it look like it would accept a bulb?
it does seem like a bulb could fit yes