https://www.pcgamer.com/cyberpunk-2077-has-a-cool-stat/

In a demo today, we learned a lot about Cyberpunk 2077: that it's a first-person shooter RPG, for one thing. But this is likely the most critical bit of information about CD Projekt's new game. As you'd expect from an RPG, your character has stats that you'll increase throughout the game, leveling up characteristics including strength, constitution, intelligence, reflexes, and tech. Also: Cool.

We don't know exactly what cool does, but we're willing to bet cool is a way of measuring your character's charisma, albeit in a cyberpunk kind of way. It's one of the main stats that govern your character, and because dialogue is a core part of Cyberpunk 2077, it seems like the most likely candidate to influence how those conversations go.