招财猫 (zhāocáimāo, 'beckoning cat') is the famous lucky cat figurine with a waving paw, seen at shop entrances across East Asia, believed to bring good fortune.
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猫咪 (māomī) and 猫猫 (māomao) are cute/baby-talk ways to say cat, like 'kitty' in English. 小猫 (xiǎomāo) means kitten.