一切經音義 5.64

5.64

瑟䋾字（二合上所乙反下摘賈反二字合為一聲呼經中書瑟吒二合舊用亦通）。

The conjunct letter *ṣṭa* (瑟䋾字): A conjunct. The upper is read with the fanqie 所 + 乙; the lower is read with the fanqie 摘 + 賈. The two characters are combined and pronounced as a single sound. Written in the sūtra as the conjunct 瑟吒 is the old usage, which is also acceptable.