01, 10, and 11 are just the first three counting numbers written in binary:

  • 01₂ = 1 in decimal
  • 10₂ = 2 in decimal
  • 11₂ = 3 in decimal

So when people write “01 10 11” in binary, they’re usually showing how binary counting starts: 1, 2, 3. It’s often used in jokes or titles like “Binary, as easy as 1, 10, 11” to say “binary is as easy as 1, 2, 3.”