U: At the end of the line, return the message.G: Send the message onto the next Clacks Tower.In the context of the novel GNU translated on the clacks system to: The acronym GNU comes from the Discworld novel Going Postal. The phrase has been used in website and server coding in order to pay tribute to Terry Pratchett in reference to Going Postal. The phrase 'GNU Terry Pratchett' has become a term among fans to mourn and also to try to help memorialise Terry Pratchett. Pratchett died on 12 March 2015, aged 66.Terry Pratchett sadly passed away in March 2015. He later made a substantial public donation to the Alzheimer's Research Trust (now Alzheimer's Research UK, ARUK), filmed a television programme chronicling his experiences with the condition for the BBC, and became a patron for ARUK. In December 2007, Pratchett announced that he had been diagnosed with early-onset Alzheimer's disease. He received the World Fantasy Award for Life Achievement in 2010. In 2001, he won the annual Carnegie Medal for The Amazing Maurice and His Educated Rodents, the first Discworld book marketed for children. He was appointed Officer of the Order of the British Empire (OBE) in 1998 and was knighted for services to literature in the 2009 New Year Honours.

With more than 100 million books sold worldwide in 43 languages, Pratchett was the UK's best-selling author of the 1990s. The final Discworld novel, The Shepherd's Crown, was published in August 2015, five months after his death. The first Discworld novel, The Colour of Magic, was published in 1983, after which Pratchett wrote an average of two books a year. Pratchett's first novel, The Carpet People, was published in 1971. Recorded May 2008 from the BBC Radio 4 programme Bookclub

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