This document summarizes the different age rating symbols used in the UK for films. It explains that a U rating means films are suitable for all ages 4 and over, while PG means parental guidance is advised for children under 8. A 12A rating means children under 12 must be accompanied by an adult, and 12 and 15 ratings mean no one younger than the stated age can view the film unaccompanied. An 18 rating and R18 rating restrict films to adults only, with R18 films only allowed in licensed venues due to explicit content.