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trig point

noun
🔊/ˈtrɪɡ pɔɪnt/
🔊/ˈtrɪɡ pɔɪnt/
(also triangulation point)
(specialist)
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  1. a position on a high place used as a reference point, especially by people who make and use maps. It is usually marked on the ground by a short stone pillar.（地图制作和使用者设的）三角点
    Word Originmid 19th cent.: abbreviation of trigonometrical point.