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Tum [possibly Sanskrit tvam thou] An ancient fraternity, formerly existing in Northern India, and well known in the days of the persecution of Buddhists there. Tum "has a double meaning, that of darkness (absolute darkness), which as absolute is higher than the highest and purest of lights, and a sense resting on the mystical greeting among Initiates, 'Thou art thou, thyself,' equivalent to saying 'Thou art one with the Infinite and the All' "; "The 'Tum B'hai' have now become the 'Aum B'hai,' spelt, however, differently at present, both schools having merged into one. The first was composed of Kshatriyas, the second of Brahmans" (TG 345).
In Slavic languages tma is still in use as a word meaning darkness.

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Tum [possibly Sanskrit tvam thou] An ancient fraternity, formerly existing in Northern India, and well known in the days of the persecution of Buddhists there. Tum "has a double meaning, that of darkness (absolute darkness), which as absolute is higher than the highest and purest of lights, and a sense resting on the mystical greeting among Initiates, 'Thou art thou, thyself,' equivalent to saying 'Thou art one with the Infinite and the All' "; "The 'Tum B'hai' have now become the 'Aum B'hai,' spelt, however, differently at present, both schools having merged into one. The first was composed of Kshatriyas, the second of Brahmans" (TG 345).
In Slavic languages tma is still in use as a word meaning darkness.