The order of using seasonings in cooking is expressed as 'sa-shi-su-se-so,' which means 'sa (sato [sugar]), shi (shio [salt]), su (su [vinegar]), se (seuyu [soy-sauce]), so (miso [soybean paste]),' in which soy-sauce is expressed as 'se' of 'seuyu,' however, it should be written in 'shauyu' in historical Japanese syllabic writing.
調味料を料理に用いる順番を表す語呂合わせの「さしすせそ_(調味料)」では、醤油は「せうゆ」として「せ」に割り当てられているが、歴史的仮名遣では「しやうゆ」と書くのが正しい。