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Picture of Nobby's tattoo by Matt Smith

Needle Ned appears in Feet of Clay in a fleeting reference. Nobby Nobbs points out that he has a tattoo on his arm saying "WUM".
It was supposed to be "MUM" but he passed out on alcohol and Needle Ned didn't spot that he was upside-down.

Presumably still decorating flesh in Ankh-Morpork...