In mathematics, a group of 15 items is known as a quindecad. Some common items that come in groups of 15 include eggs in a carton, months in a quarter, and players on a Rugby team. Additionally, elements in the lanthanide series of the Periodic Table have atomic numbers that are multiples of 15.
Soda comes in groups of 6
states
dogs
what comes in groups of 12
Arms, legs.
gaggle of geese
Inches in a foot
Pennies
scorpion legs
Case of beer
days in a week
A pair of trousers