What do these things have in common?
- Muses in Greek mythology
- the third square number
- the symbol of completeness in the Bahá’í faith
- the number of justices typically comprising the US Supreme Court
- circles of Hell
- choirs of angels
- the number of days it takes for an anvil to fall to Earth from Heaven
- universal substances in the Vaisheshika school of Hindu philosophy
- years Fancy Notions has been online as of today
They are all nine. Turn me on, dead man.