What's the symbol for "moron"?

[Svengoolie 3]

Seriously, I've never seen this symbol before and I guessed what it meant.

https://thechive.com/2017/09/27/guy-gets-same-tattoo-as-rescue-dog-before-knowing-its-meaning-has-immediate-ragrats-4-photos/?utm_source=Keywee&utm_medium=Paid&kwp_0=1265395&kwp_4=4041969&kwp_1=1682812&fbclid=IwAR2pkmE40LujoixuRizGPxgnqzqz82g0Re4ZudgR3OdEtnA4uOoT4W27PY4

I do like the guy for rescuing  the dog, and I just hope he's  smart enough to take care of him...