From ibikeu Wiki

The bicycle is a rotary device and traditionally has a rotary bell. We highlight the large Chinese Rotary bell.

Other rotary bells receive their movement like a dynamo, by being moved towards the tire, and make a heck of a racket. They are occasionally offered on ebay.de. Terms: "Radlaufklingel", "Sturmklingel".

Racing bikes have less time on the road and therefore use a ping-bell which responds faster, less leisurely.

In a highly motorised environment the use of the whistle has been advised and recommended. Sources for cheap whistles include Action Enterprises and AKImports

Bells and whistles are generally used to communicate with car-drivers who tend to overlook us or underestimate our speed. They are part of Assertive Cycling.

The considerate cyclist uses a more modest intensity of noise when approaching pedestrians from behind. Cycling traditions in different countries have various standards of appropriate warning noises and more generally the Meaning of Bicycle Bells.

In group rides I have also heard shouts like "on your left" when being overtaken by another bike

The bell can also be used as a friendly greeting among cyclists riding in opposite direction, thereby acknowledging each other and congratulating themselves to their choice of transport.

How Howe Howls

Monica Howe, formerly of the LACBC, has been heard effectively imitating the noise of a police siren with her voice. Mastery of this art is sure to repay the effort. It should be part of any bicycle safety course.

sssssssssss

In the encounter with pedestrians, especially those approaching cars and about to open thoughtlessly the door into the path of the cyclist, a sharp prolonged sssssss has proved effective.