J. T. Milik in 3Q15 11.12 reads byt ‘sdtyn and takes the second noun to be a dual, “Bet Esdatain;” the meaning could be “(in) the House of the Two Pools.” See Milik, “Le rouleau de cuivre provenant de la Grotte 3Q (3Q15),” in Les ‘Petites Grottes’ de Qumran, ed. M. Baillet, J. T. Milik, and R. de Vaux (Discoveries in the Judaean Desert 3; Oxford: Clarendon, 1962) pp. 214, 271.