What is this device called?

Meo designs in Germany were the first place I saw something like this. There’s lots on Chinese ones from the usual places now though. Don’t know what it’s called though

 

Male Chastity Now calls it a "cock trap" but lots of other companies offer them under different names. The basic concept is that the steel rod along the top combined with a urethral insert prevent erections. Beyond the obvious risk associated with put something in your urethra, some have reported irritation of the meatus.