なな・しち
seven
Take a 7 and tip it over backwards. Nana has seven of them on the mantelpiece, one china cat per grandchild: なな.
なな is the safe default. しち holds on in 七月 しちがつ, but gets avoided otherwise because it's too easy to mishear as いち.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.