KanjiJLPT N3
Number

nickname, number, item, title, pseudonym, name, call

Mnemonic

A mouth calls out each number while a sickle carves it into the gatepost. One by one, every house gets its designation — the mouth announces, the sickle etches. No home is left unnumbered.
Additional thoughts
Picture an old village census: a caller shouts the next number, and a worker with a sickle scores it into each wooden gate. The mouth assigns, the sickle makes it permanent.
Quick recall
A mouth shouts each number as a sickle carves it into the gate.

Details

The keyword for 号 is number. This kanji refers to a designation or assigned number used to identify or label things in sequence, such as issue numbers, model numbers, or house numbers. It can also mean a name, title, or signal, as in giving a command or cry. The sense of calling out or designating is central to its meaning.
On'yomi
ごう
Kun'yomi
さけ.ぶ、よびな