ACAB (All Cops Are Bastards) is an acronym used as a political slogan associated with dissidents who are opposed to the police. It is typically written as a catchphrase in graffiti, tattoos or other imagery in public spaces. It is sometimes numerically rendered as "1312," representing the ordering of the letters in the English alphabet. It's illegal to expose that acronym in public space.
Everyday the public clock of Rotterdam exposes this acronym for 1 minute.