ennead (EN-ee-ad) - n., a group of nine.
There are few famous groups of nine things, including one local grouping of ancient Egyptian gods worshiped around Heliopolis, and a collection of philosophy books by Plotinus. Nine being a common significant number, being three threes. Adopted around 1650 from Greek, from ennea, nine. And in conclusion, hail muse!
Outside the bank, an ennead of Girl Scouts waited by a table piled with boxed cookies.