Buddhist scriptures often use 'as numerous as the sands of the Ganges' to describe an enormous quantity.
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恒 (constant) + 河 (river) is a phono-semantic match for the Sanskrit 'Gaṅgā', introduced via Buddhist scripture translations. The idiom 恒河沙数 (Hénghé shāshù, 'sands of the Ganges') comes from the Diamond Sutra and means 'an incalculable number'.
