Siddham script; Siddham characters
Refers to the Siddham script, an ancient Indian writing system used historically in East Asian Buddhism for writing Sanskrit mantras and seed syllables.
from Sanskrit
Have you ever seen Siddham characters at a temple?
Siddham studies
Abbreviation of 悉曇学 (しったんがく), the academic study of the Siddham script and related Buddhist texts.
See also: 悉曇学
He is majoring in Siddham studies at university.
Siddham studies
Siddham script
From Sanskrit siddhaṃ, via Chinese 悉曇 (xītán). The term originally referred to the script used for writing Sanskrit in Buddhist contexts.