Elecromagnetic waves (light) that can't be seen by humans because they're of a much higher frequency than we can see. Litterally, beyond red. Often used for wireless devices such as remote controls and hearing impaired systems. Such systems can be interfered with by outdoor light, candle light, and objects in the path of the transmitter to reciever. Abbreviated IR.
Infra-Red is the third single from Placebo's sixth studio album, Meds, and was released on the 19th June 2006. It is a typical passive-aggressive Placebo song, whose video has become very popular. The song peaked #42 in the UK, #35 on the US Modern Rock Tracks chart, and #91 in Germany.