55 may refer to: *

55 (number) 55 (fifty-five) is the natural number following 54 and preceding 56. Mathematics 55 is *a triangular number (the sum of the consecutive numbers 1 to 10), and a doubly triangular number. *the 10th Fibonacci number. It is the largest Fibonacci ...

55 BC __NOTOC__ Year 55 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Crassus and Pompey (or, less frequently, year 699 ''Ab urbe condita''). The denomination 55 BC for this year has been us ...

AD 55 AD 55 ( LV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar and Vetus (or, less frequently, year 808 ''Ab urbe condita''). Th ...

1955 Events January * January 3 – José Ramón Guizado becomes president of Panama. * January 17 – , the first nuclear-powered submarine, puts to sea for the first time, from Groton, Connecticut. * January 18– 20 – Battle of Yiji ...

2055 In contemporary history, the third millennium of the anno Domini or Common Era in the Gregorian calendar is the current millennium spanning the years 2001 to 3000 (21st to 30th centuries). Ongoing futures studies seek to understand what is l ...

Science

*Caesium, by the element's

atomic number The atomic number or nuclear charge number (symbol ''Z'') of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number (''n''p) or the number of protons found in the nucleus of every ...

Astronomy

*Messier object M55, a magnitude 7.0 globular cluster in the constellation Sagittarius *The New General Catalogue object

NGC 55 NGC 55, is a Magellanic type barred spiral galaxy located about 6.5 million light-years away in the constellation Sculptor. Along with its neighbor NGC 300, it is one of the closest galaxies to the Local Group, probably lying between the Milk ...

, a magnitude 7.9 barred spiral galaxy in the constellation Sculptor

Transportation

*The highest speed limit allowed in the United States between 1974 and 1986 per the

National Maximum Speed Law The National Maximum Speed Limit (NMSL) was a provision of the federal government of the United States 1974 Emergency Highway Energy Conservation