I ALWAYS carry MY keys like THAT! /S
It’s a curved blade knife called a karambit. My kids recognized it right away from their video games.
https://www.google.com/search?q=karambit&client=ms-android-verizon&prmd=sivn&sxsrf=ALeKk02ux-qU2CmnYm8ETPNDkUANZq1CBg:1598462366577&source=lnms&tbm=isch&sa=X&ved=2ahUKEwi8mq-ssLnrAhUQJt8KHW_4BIgQ_AUoAnoECBYQAg&biw=412&bih=783&dpr=2.63#imgrc=dNTo-9FkSVwFFM