nickname, number, item, title, pseudonym, name, call
号 centers on a label used to identify or call something: a name, nickname, pseudonym, title, or number. The idea of calling out or shouting is a natural extension of using a vocal label.
号 is the simplified form of 號. The older form combines 号 (which likely represented a sound or call) with 虎 (tiger), suggesting a tiger's roar or a loud call. The modern simplified form retains the core 号 component.
The top 口 is a mouth, and the bottom 丂 looks like a breath or sound coming out. Picture a mouth calling out a name or number: 号 is a label you call.
For ゴウ, imagine a sumo wrestler's ring name being announced with a loud 'Go!' as he enters: Go! -> ゴウ, and that ring name is his 号.
number; edition; make; model; issue; part of that group
number; series of digits
signal; signalling; signaling
code; password; cipher
sign; symbol; mark
suffix for train car numbers
title; name; degree
name of an imperial era (e.g. Heisei, Shōwa); Japanese era name
crying loudly; bawling; wailing; lamentation
number on the back of a player's uniform; uniform number; shirt number; squad number
sign; mark; symbol; code
red light (traffic)
name of an imperial era (e.g. Heisei, Shōwa); Japanese era name
newspaper extra
order (esp. to a number of people); command
angry roar; bellow
number two
traffic light; traffic signal
account number (bank, etc.)
registration number
telephone number; phone number