Phonetic symbols: English [twelv] and American [twelv]. The ordinal number of 12 changes irregularly, so it is necessary to change ve to f, and add th, twelve, and the phonetic symbols: English [twelfθ] and American [twelfθ].

Can be used as nouns and adjectives, such as theyearrisdividedintowelvemonths. Twelve also means 12 as a noun, for example, ishallstayhereuntittwelveo \' clock. For example, the ordinal number 12 is the twelfth; Ihadtohalfanhourtojump，Iwastwelfthinline .