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* 书法笔法用字。《 古今圖書集成·字學典· 第八十三卷·書法部彙考· 一·宋陳思書苑菁華· 翰林密論二十四條用筆法》："丨， 豎法：口訣云擡筆豎策挫鋒， 上下緊直，嘗尚字中豎畫用。"

(translated) Used in calligraphy brushstrokes; refers to the vertical stroke technique