Where does “???” come from?

??? (Gandhari) comes from Sanskrit शर्करा, from Proto-Indo-Aryan śárkaraH, from Proto-Indo-Iranian ćárkaraH, from Proto-Indo-European ḱorkeh₂ — gravel, boulder; boulder; gravel.

Ancestry of “???”, step by step

StepLanguageWordMeaning
1Sanskritशर्कराgravel, grit, pebbles, shingle, gravelly mould or...
2Proto-Indo-AryanśárkaraH—
3Proto-Indo-IranianćárkaraH—
4Proto-Indo-Europeanḱorkeh₂gravel, boulder; boulder; gravel
Every word from Proto-Indo-European ḱorkeh₂ →Every word from Proto-Indo-Iranian ćárkaraH →Every word from Proto-Indo-Aryan śárkaraH →