PRISM is a clandestine surveillance program under which the United States National Security Agency (NSA) collects internet communications from at least nine major US internet companies. Since 2001 the United States government has increased its scope for such surveillance, and so this program was launched in 2007.

PRism is an open access peer-reviewed electronic academic journal published by Massey University and Bond University, covering public relations. The editor-in-chief is Elspeth Tilley (Massey University). The journal was established in 2003.

In optics, a prism is a transparent optical element with flat, polished surfaces that refract light. At least two of the flat surfaces must have an angle between them. The exact angles between the surfaces depend on the application. The traditional geometrical shape is that of a triangular prism with a triangular base and rectangular sides, and in colloquial use "prism" usually refers to this type. Some types of optical prism are not in fact in the shape of geometric prisms. Prisms can be made from any material that is transparent to the wavelengths for which they are designed. Typical materials include glass, plastic and fluorite.