amplifier
amplify
announcement
attention
beware
broadcast
bullhorn
call
caution
cheer
cheer leading
cheerleader
cheerleading
competition
design
distance
element
emergency
girl
handle
horn
icon
illustration
leader
leading
loud
loudspeaker
mega
mega phone
megaphone
noise
outdoors
phone
pompom
precaution
protection
range
school
sign
silhouette
speak
speaker
sport
survives
symbol
team
voice