Black and white illustration of a whistle with a lanyard and sound waves
Schlüsselwörter
whistle,
sport,
ref,
coach,
game,
competition,
announcement,
signal,
sound,
noise,
loud,
alert,
warning,
danger,
emergency,
control,
authority,
guidance,
training,
exercise,
fitness,
activity,
play,
fun,
illustration,
drawing,
vignetting,
outline,
black-and-white,
monochrome,
vector,
graphic,
design,
icon,
symbol
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