Where does “𑂃𑂮𑂹𑂞𑂱𑂩” come from?

𑂃𑂮𑂹𑂞𑂱𑂩 (Magahi) comes from Sanskrit स्थिर — stable.

𑂃𑂮𑂹𑂞𑂱𑂩 (Magahi): stable, steady