Fatto generale: 255 is the largest values that can be assigned to elements in the 24-bit RGB color model, since each color channel is allotted eight bits.
Fatto matematico: 255 is a repdigit in base 2 (11111111) in base 4 (3333), and in base 16 (FF).
Trivia: 255 is the largest representable integer in an unsigned byte.
Data storica: September 11th is the day in 1971 that the Egyptian Constitution becomes official.