Meaning of つるかめ in Japanese

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Definition of つるかめ

つるかめ(tsurukame) 【鶴亀】

(n) crane and tortoise (symbol of longevity, artistic motif) →Related words: 鶴は千年亀は万年

つるかめざん(tsurukamezan) 【鶴亀算】

(n) obtaining the respective numbers of cranes and tortoises from the total of their heads and legs; calculating the values of two unknown quantities from their unit total and the total of one of their attributes