Fatto generale: 52 is the approximate number of weeks in a year.
Fatto matematico: 52 is the 5^{th} Bell number.
Trivia: 52 is the number of letters in the English alphabet, if majuscules are distinguished from minuscules.
Data storica: February 21st is the day in 1613 that Mikhail I is elected unanimously as Tsar by a national assembly, beginning the Romanov dynasty of Imperial Russia.