What is Elon Musk's AI stock called?

I'm curious, could you enlighten me on the name of the AI stock that Elon Musk is associated with? I've heard of his involvement in various tech and finance ventures, but I'm specifically interested in the AI-related one. Is there a specific ticker symbol or company name that I should be looking for? Your expertise in the field of cryptocurrency and finance would surely provide me with valuable insights.