Roamin' Numerals

Okay, Daniel King, listen up! You think you're some kinda wordsmith, huh? I see you created this thing. Here is how it works: You set up the question by asking what to call number that move around. Then you deliver the punchline "Roamin' Numerals" - it's a play on words! It sound like "Roman Numerals" but suggests numbers that are moving around (roaming). Are you following? It's a play on words, get it? That's called a pun.