Silicone

Silicones are certain chemical compounds which consist of polymers made up of silicon-oxygen and silicon-carbon bonds. They can vary in consistency from slimy goo to hard rubber. Most famously (or infamously), silicone was and still is used as a filler in breast augmentation implants. Silicone is also used in the toy Silly Putty.

Silicone ("silly-kohn") is often mistaken colloquially for elemental silicon ("silly-kahn"), because of the similarity in pronunciation, but they are entirely different. For example, in the Shakira song "Objection (Tango)", the lyrics "next to her cheap silicon I look minimal" should be "next to her cheap silicone I look minimal".