咆号 is read as ほうごう (hougou) and means yell.
ほうごう
hougou
ばんごう
number
しんごう
traffic light
きごう
symbol
ごう
size (of printing types, canvases, knitting needles, etc.)
ねんごう
name of an imperial era (e.g. Heisei, Shōwa)
げんごう
ふごう
sign (e.g. positive, negative)
どごう
angry roar
にごう
number two
あかしんごう
red light (traffic)
せばんごう
number on back of player's shirt
しょうごう
title