For the uninitiated, Pr0n is slang for pornography. This is a deliberately inaccurate spelling / pronunciation for porn, where a zero is often used to replace the letter O. It is sometimes used in legitimate communications (such as email discussion groups, Usenet, chat rooms, and internet web pages) to circumvent language and content filters, which may reject messages as offensive or spam. The word also helps prevent search engines from associating commercial sites with pornography, which might result in unwelcome traffic. Pr0n is also sometimes spelled backwards (n0rp) to further obscure the meaning to potentially uninformed readers. It can also refer to ASCII art depicting pornographic images, or to photos of the internals of consumer and industrial hardware.