Keyword
ID number
Info
FrequencyTop 700-800
Type
Kyōiku (3rd grade) 
?
Shinjitai ?
KankenLevel 8
Heisig1330
Old form
Readings
ごう
(100%)
Composed of
mouth
be unable to breathe
Mnemonic

If you want to spell out a particularly long ID number with your mouth in one go, well, you will be unable to breathe while you're spelling in out.

Used in kanji (1 in total)
ID number [old]
Used in vocabulary (588 in total)
number; edition; sobriquet; pen-name; size (of printing types, canvases, knitting needles, etc.); suffix attached to names of ships, trains, airplanes, etc.
number; series of digits
signal; signalling; signaling; traffic light; traffic signal
Examples (200 in total)
They came by Route 17.
I took Highway 58.
I'll be your first patient.