n999
What is this a rebus for?
Hint:
The answer can be found underground
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What is this a rebus for?
Hint:
The answer can be found underground
Is it:
Mines
As in:
n-nines
nnines
mines
They're underground
Is it:
Hades
Logic:
n could be 'not' as 'upside-down', and 999 upside-down is 666, which is the Devil's name, and he lives in the underworld, i.e. Hades.