Fatto generale: 155 is the number of performances Ivanhoe, the romantic opera that opened in January 31, 1891, ran for.
Fatto matematico: 155 is the sum of the primes between its smallest and largest prime factor.
Trivia: 155 is the maximum possible score in a single break in snooker, with a free ball at the start of the break (147 is the highest possible without a free ball).
Data storica: June 3rd is the day in 1982 that the Israeli ambassador to the United Kingdom, Shlomo Argov, is shot on a London street.