15 Oz Coffee Mugs

coffee mugs
(coffee mug) a mug intended for serving coffee
A mug is a sturdily built type of cup often used for drinking hot beverages, such as coffee, tea, or hot chocolate. Mugs, by definition, have handles and often hold a larger amount of fluid than other types of cup.

15
fifteen: being one more than fourteen
fifteen: the cardinal number that is the sum of fourteen and one
The Plus 15 or +15 Skyway network in Calgary, Alberta, Canada, is the world's most extensive pedestrian skywalk system with a total length of and 59 bridges. The system is so named because the skywalks are approximately 15 feet (approximately 4.5 metres) above street level.

oz
The ounce (abbreviated: oz, the old Italian word onza, now spelled oncia; apothecary symbol: ?) is a unit of mass with several definitions, the most commonly used of which are equal to approximately 28 grams.
Australian
ounce: a unit of weight equal to one sixteenth of a pound or 16 drams or 28.349 grams
Oz (aka Oz - A Rock 'n' Roll Road Movie also released as 20th Century Oz in United States) is a 1976 Australian film written, directed and co-produced by Chris Lofven.