Infinity.

Hehe somehow I'm fascinated with all these infinity things.

Icons that boosts your mental strength (psychological effect)

I ain't mentally weak, but visual reminders are a bonus, especially when they're permanently engraved on your skin.

It's hard to always gather willpower, sometimes it gets too tedious to even summon it up.

So if I were to really get inked, it ain't just for aesthetic purposes.