Invincble slab of cement carried around by people with no skill in version 1.6 of counterstrike. Protects against anything thrown at it, including boiling acid and star wars geeks. It cannot be scratched by nuclear weapons. Advised to no be used for fear of people trying to gang rape you in a corner.
When used in groups, the riot shield is reminiscient to a large wall of bobbing rectangles coming to eat your testicles and pickle your penis.
Also used by modern day police in a less powerful version that can actually be broken if fired at by 30 clips of an AK-47.