The difference between a Bidet and a Bidett

This is a traditional Bidet, notice the water shoots up from the bottom. The installation of this fixture requires the application of many plumbing rules and is very expensive to comply with all those rules and regulations, to do with backflow prevention, water temperature, all very boring things unless your a plumber.

A Bidett is a poor man’s Bidet, the water comes over the top. They are not subject to the same rules and regulations and are much cheaper to install.

or a kids hand basin

I think this one was installed incorrectly