In Terry Pratchett's Discworld series, the clacks are a series of semaphore towers loosely based on the concept of the telegraph. Invented by an artificer named Robert Dearheart. The towers could send messages "at the speed of light" using standardised codes.
Three of these codes are particularly important:
G: send the message on
N: do not log the message
U: turn the message around at the end of the line and send it back again
N: do not log the message
U: turn the message around at the end of the line and send it back again
When Dearheart's son John died due to an accident while working on a clacks tower, Dearheart inserted John's name into the overhead of the clacks with a "GNU" in front of it as a way to memorialize his son forever (or for at least as long as the clacks are standing.)
GNU Pterry - your name is spoken and you are remembered.
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