[agemame]

There used to be the subscript C added to U ratings to indicate something particularly child suitable, but that seems to have fallen out of favour.

Remembering that PG-13 only really came in in the US following the backlash to the darker content in Indiana Jones and the Temple of Doom, there's always been an awkward gulf between those age blocks, which I think they tried to address over herewith more narrative descriptions with the certification, but it's not an easy thing by any stretch.