81 (Number)

In mathematics

In science

• The atomic number of thallium

• Messier object M81, a magnitude 8.5 spiral galaxy in the constellation Ursa Major, also known as Bode's Galaxy, and the first of what is known as the M81 Group of galaxies
• The New General Catalogue object NGC 81, a spiral galaxy in the constellation Andromeda
• The Saros number of
• the solar eclipse series which began on -322 May 12 and ended on 958 June 19. The duration of Saros series 81 was 1280.1 years, and it contained 72 solar eclipses.
• the lunar eclipse series which began on -20 February 19 and ended on 1296 April 19. The duration of Saros series 81 was 1316.2 years, and it contained 74 lunar eclipses.

In other fields

• the title of a short film by Stephen Burke: 81
• the model number of: Unterseeboot 81, Sinclair ZX81
• the number of the French department Tarn
• the designation of Interstate 81, a freeway that runs from Tennessee to New York.
• the code for international direct dial phone calls to Japan
• the number of times a popular rhyme (erroneously) claims Lizzie Borden struck her parents with an axe
• One of two ISBN Group Identifiers for books published in India
• Number of stanzas in the Tao te Ching (in the most common arrangements).
• Baby 81, Abhilasha Jeyarajah, a baby survivor of the tsunami, claimed by many different parents.
• The year AD 81, 81 BC, or 1981.

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