Where does “зөөлний тэмдэг” come from?

зөөлний тэмдэг (Mongolian) comes from Russian мя́гкий знак — Name of the letter Ь, ь, the soft sign.

Ancestry of “зөөлний тэмдэг”, step by step

зөөлний тэмдэг traces back through two separate lines of ancestry.

via Russian мя́гкий знак

StepLanguageWordMeaning
1Russianмя́гкий знакName of the letter Ь, ь, the soft sign

via Mongolian тэмдэг

StepLanguageWordMeaning
1Mongolianтэмдэгsign; mark; symbol
Every word from Russian мя́гкий знак