noun
Siddham script; Sanskrit script
Refers specifically to the Siddham script used in Japanese Buddhism to write Sanskrit mantras and seed syllables. Not a general term for any Sanskrit writing system.
お寺で梵字が刻まれた石碑を見た。
I saw a stone monument carved with Siddham characters at the temple.
梵字は主に密教で用いられる。
Siddham script is mainly used in esoteric Buddhism.
悉曇 is another name for the Siddham script, often used in academic or historical contexts. 梵字 is the more common term in general Buddhist contexts.
From 梵 (bon, 'Brahman; Sanskrit') + 字 (ji, 'character'). The term originally referred to any Indian script but became strongly associated with the Siddham script in Japanese Buddhism.