Also known as linear property, per unit length, per unit distance, lineic quantity, per length, length density, linear density
measure of a quantity of any characteristic value per length
線密度也稱為纖度，是指一物體單位長度下的質量，可用來描述線或是其他一維物體的密度。一般會用（或λ）來表示。國際單位制下線密度的單位為公斤每公尺，國際符號為kg/m。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).