50 (number)

In mathematics

In science

• The atomic number of tin
• The fifth magic number in nuclear physics
• The percent of genetic overlap of a parent and offspring.

  In religion

• In Kabbalah, there are 50 Gates of Wisdom and 50 Gates of Impurity
• The traditional number of years in a jubilee period.
• The Christian Feast of Pentecost takes place on the 50th day of the Easter Season

  In sports

• In cricket one day internationals, each side may bat for 50 overs.

  In other fields

• There are 50 states in the United States of America. The TV show Hawaii Five-O and its reimagined version, Hawaii Five-0, are so called because Hawaii is the last of the states to officially become a state.
• 5-O - Slang for police officers and/or a warning that police are approaching. Derived from the television show Hawaii Five-O
• A calibre of ammunition
• In millimetres, the focal length of the normal lens in 35 mm photography
• The percentage equivalent to one half, so that the phrase "fifty-fifty" commonly expresses something divided equally in two; in business this is often denoted as being the ultimate in equal partnership
• In years of marriage, the gold or "golden" wedding anniversary
• The speed limit, in kilometres per hour, of Australian and Canadian roads with unspecified limits.