It would be awesome to be able to whistle to another player to get their attention. Each race could have a distinct sound when they whistle. Also, if you’re in a cavernous type area you could follow the echo, or maybe even have the sound of the echo have a visual effect on the mini map so it is easier to follow it’s direction.
Whistling should be an emote like waving or “jumping wild shouting out loude for attention”. The idea with the echo would be real cool. May be a good torch or Zippo would do the job as well, but echos for the ambient atmosphere of caves or mountain sides will bring the right feeling 😉
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