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I would do what people actually do, and call it something descriptive. Here is an Online Etymology Dictionary that can tell you when and how various words in the English language originated and evo...
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Source: https://writers.stackexchange.com/a/36290 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would do what people actually do, and call it something descriptive. Here is an [Online Etymology Dictionary](https://www.etymonline.com/word/signal) that can tell you when and how various words in the English language originated and evolved, where they came from. It can be very helpful in giving you ideas for how to make up replacements. You will find that most words are actually rather plain, shortened versions of metaphors or descriptions, or just trace to representative nouns: The word "line" comes from "linen" which comes from "linum", the Latin name of the flax plant from which linen fibers are extracted. "Flax" itself is a different name from a different language; and our word "flaxen" refers to the yellow blond color of the plant. Perhaps you can use a variation on "flax" for "line", or in your made-up language try to see this thing you must describe as if you have never seen one before, and decide what words might be used as shorthand. This can be influenced by culture: Look up "traffic" and you will see it relates to trade or commerce, with the same root as "trans-", meaning "across", plus "fricare", for "friction". In fact a traffic light means a "signal to cross / not cross", both for cars and pedestrians, to reduce "crossing friction" (collisions). Speaking of "signal" it comes from "sign" which meant "gesture". Speaking of "Cross", it is from the latin word "crux" the name of the device upon which a crucifixion is accomplished. A synonym for "crossing" is "intersection", your "traffic light" could be an "intersection manager". The origin of words is obviously very idiosyncratic, based on other words and whatever concept happens to take hold first. But whatever the language, the procedure of finding a new name for an invention is seldom just an arbitrary made of set of sounds: It is descriptive. In "traffic light", "lights" were already often taken as a symbol: Remember in the midnight ride of Paul Revere, it was lanterns hung in a tower, "one if by land, two if by sea". We are still not 100% settled on what to call electric lights: What we call "electric light" is probably an extension of very early distinctions between "candle light" and "day light" and "torch light", but we could have easily come to call them electric "lamps", "torches" or lanterns". In fact, electric flash lights are still called "torches", and "lamp" is now most commonly used to mean an **electric** lamp: It once referred to a wick/oil lamp, but now we almost always call that a "lantern". It is better to root your made up words (or descriptions) in some history to make them more plausible, and also to reduce the burden of memorization on the reader. Also, realize that for any ideas or objects we refer to frequently, we humans have a tendency to shorten for efficiency in speaking and writing. For example, "Crossing against the light" or "running the light", as phrases in isolation, are hard to make sense of, without the prior concept of a **traffic light** that manages an intersection to minimize the risk of collisions. If possible, you want your made up words, coins, dress, behaviors, etc to be alternate versions of things we have: The reason we can translate most words in one language into another is because we humans have largely converged on a consensus of important **_concepts_** to be represented by language, and we differ only on the details of forming sounds and grammar. So when you need words for "eyeliner" or "traffic light", treat them as a **translation** , and etymology (how the word came to me) can provide some fodder to help give you ideas of alternative ways a word might have plausibly evolved. If your POV character just needs to describe (once) the function of a traffic light they have never seen before, exploring the etymology can help you get the idea of "painting the borders of the eyelids for contrast" or the idea of "managing a crossing to prevent collisions".