Tantrasara mentions the iconography with the goddess Bagulamukhi. It mentions the goddess is seated on the golden throne floating inside the amazing ocean. A further etymology implies that valga signifies "to paralyze" and symbolizes the power of stambhana, "paralysis" the goddess is alleged to grant; this theory looks questionable https://emilianoryyyw.bcbloggers.com/31919793/detailed-notes-on-baglamukhi