Bike bells are fun, they come in a variety of shapes and sizes with different simple mechanical methods of creating the renowned sound which everyone recognizes as the presence of a bike. It's a friendly sound, not at all like a car horn, though air horns are available but are prone to wearing out and are not as dependable as the simplicity of a bike bell.
Here's some information on the Symbolism of bells: "Bells are also ancient symbols of protection and ringing them have long been considered a way to ward off negativity". And that is precisely the intention of using a bell on one's bike.
Here's a quote from "how to make a bike bell louder" article.
"I can’t imagine getting around the city on a bike without a bell.
I tried using a rather loud bike horn for almost a year, but it didn’t quite work out, unfortunately. Yes, it was much louder than any bell, but pedestrians wouldn’t move away upon hearing it, instead choosing to stop and look back to check what all the noise was about. ;) The bell sound is indeed rooted deeply in peoples’ minds, and there doesn’t seem to be a better warning signal around for a cyclist to use. Moreover, the bell sound is relatively high-pitched, so it’s much better heard amidst the city buzz than the horn, the sound of which gets lost within the noise of passing cars".
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