• Start Boneworks.
  
• Look at the palm of your player's hand.
  
• Take note of the 3 calluses at the base of the fingers.

This is why it is called the "Index", as it is the only finger left soft.

This was an intentional design choice by Gabe Newell himself. As he understood that gamers are the most oppressed minority, and for the day we find lovers, he insisted we keep at least one finger soft for their pleasure.

"They're already gamers. But we don't want their whole hand to be rougher than a rhinoceros' scrotum! If one of em accidently touches a ♥♥♥♥♥ he won't even know what it feels like for Christ's sake! Fix it!"
~Gabe Newell 2017

At the same time he knew that it would give us a calling card. A symbol for us to unite under. The mark of the true gamer!

If you meet someone with this mark. Know you are meeting a kindred spirit, a brother...a gamer

(or a crazed gunman)