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Why are spoke nipples called nipples?

Does anyone know the etymology of the term 'spoke nipple'? The wiki page on Spoke Nipple and even google doesn't have the answer. Are there other threaded mechanical screws that are more like ...
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0answers
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9x4 spoke pattern

I am shopping around for a high end commuting bike. Several reputable manufacturers, including Batavus and Trek are using rims with 9x4 spoke hole pattern. Here are a couple examples: ...