Fatto generale: 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).
Fatto matematico: 155 is the sum of the primes between its smallest and largest prime factor.
Trivia: 155 is the number of performances Ivanhoe, the romantic opera that opened in January 31, 1891, ran for.
Data storica: June 3rd is the day in 1658 that Pope Alexander VII appoints François de Laval vicar apostolic in New France.