習俗custom / convention)係指同一個社會當中嘅人普遍認同係「慣常」嘅行為;跟習俗做嘢叫約定俗成。喺符號學,約定俗成(conventional)係指符徵嘅意義係人為添加,本身同符指並冇類似性或者邏輯上嘅關係。

例如:喺粵語地區,去花市返屋企係過年嘅一個習俗。

又例如:喺英文,「」 係 「cat」,但係個字同貓冇任何類似性,亦唔會令人聯想到貓,但係講英文嘅人傳統上係咁叫,所以個字有咗咁嘅意思。喺一啲領域(例如電腦科學)咁叫隨意(arbitrary),但係喺符號學,因為有習俗約束,咁係約定俗成,唔係隨意。

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