This obsolete spelling uses a digraph including the letter ㅅ to represent the tensing of the other consonant, a phenomenon now represented with doubled consonants. For instance, modern 꿈(kkum) was written ᄭᅮᆷ(kkum). This spelling, called the 된시옷 (doensiot) or "tense s" spelling, was the most common way to write tense consonants until at least around 1900. The "tense s" spelling continued to be common into the early twentieth century until it was deprecated in the major spelling reforms of the 1930s.