Question

How do you say rape whistle in Spanish?

Answer 1

You could either say silbato de violación or violación silbato. // The first one is more formal, probably more likely to be used as a newspaper title while the second one is more relaxed and would most likely be used more in the everyday Spanish community.

Answer 2

It definitely wouldn't be "silbato de violación" or "violación silbato".

I haven't heard them called by a specific name, I don't think they are that common... You'd just describe it / explain that it's a silbato para alerta ante un ataque sexual / silbato para alerta ante acoso or something similar.