15 (Number)

In mathematics

In science

• The atomic number of phosphorus.

• Messier object M15, a magnitude 7.5 globular cluster in the constellation Pegasus.
• The New General Catalogue object NGC 15, a spiral galaxy in the constellation Pegasus.
• The Saros number of the solar eclipse series which began on -2557 July 1 and ended on -1223 September 8. The duration of Saros series 15 was 1334.2 years, and it contained 75 solar eclipses.
• The Saros number of the lunar eclipse series which began on -2219 April 30 and ended on -921 June 19. The duration of Saros series 15 was 1298.1 years, and it contained 73 lunar eclipses.

In other fields

• The age of a quinceaera, a Hispanic girl celebrating her fifteenth birthday.
• The age for obtaining a driver's (or learner's) permit in jurisdictions where the age for a driver's license is sixteen.

• The number of days in each of the 24 cycles of the Chinese calendar.
• The number of guns in a gun salute to Army, Air Force and Marine Corps Lieutenant Generals, and Navy and Coast Guard Vice Admirals.
• The designation of Interstate 15, a freeway that runs from California to Montana.
• The number of players on a rugby union team.
• In rugby union the full back wears the 15 shirt.
• The '15 refers to the first Jacobite Rising in Great Britain in 1715.
• The number of checkers each side has in the beginning of a backgammon game.
• Fifteen, a television program.
• A restaurant in London, built by celebrity chef Jamie Oliver
• In the United States, the customary percentage to tip a waitress in a restaurant by one or two guests
• The number of balls in the eight ball variant of billiards
• The number of function keys on most Mac keyboards
• Historical years: 15 A.D., 15 B.C., or 1915
• The name of a modern punk band with lead singer Jeff Ott.

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