I found this in my son’s junk drawer. I can’t figure out what it belongs to or what it is. Any ideas?

I kept turning the little red shape over in my hands, feeling ridiculous for caring so much about a scrap of plastic. Yet there was something stubborn in me that refused to let it go. It looked designed, intentional, almost clever. We circled through theories: toy weapon, bike part, some forgotten gadget. Every guess only deepened