The twelve-inch single (often written as 12-inch or 12″) is a type of vinyl (polyvinyl chloride or PVC) gramophone record that has wider groove spacing and shorter playing time with a "single" or a few related sound tracks on each surface, compared to LPs (long play) which have several songs on each side.
It is named for its 12-inch (30 cm) diameter that was intended for LPs. ... https://en.wikipedia.org/wiki/Twelve-inch_single
