I guess it's more creative than straight-up asking if we're Norwegian.
I don't even have them in my alphabet
Isn't ø a math thing?
∅ in Mathematics is indeed one of the symbols for null, but ∅ is a letter in the Norwegian/Danish alphabet. Just because Σ is a Mathematics symbol as well doesn't mean it stops being a letter of the Greek alphabet...
I kinda just thought it was a 0 with a slash through it.
Ah well. You learn something new every day.
Yeah, it means no solution.
Yeah, that's what I thought. That's like saying I don't have 9 in my alphabet.
It's also a symbol in chord notation that represents a half diminished chord. Only musicians would know that though...