I never really got the concept of numbers during haircuts. like all of a sudden my barber asks me about what number i wnt and i just don’t know what to say. i’ve been saying 2 for the longest time but honestly idk what that means. why is it only 1,2,3. why aren’t there more numbers? I feel like i’ve been saying the numbers too long to actually ask about them. help 

If he’s using clippers, it’s the size of the guide comb. Higher numbers leave longer hair: