Same entry in other lexica: see the references at Photius nu1 Theodoridis.
West (below) 77: "[t]he nablas or nabla was a Phoenician harp that arrived in Greece about the end of the fourth century BC. Its sound is described as 'throaty'. It was played without a plectrum, and was regarded as suitable for merrymaking."
See also LSJ(9) s.v. na/bla, h(: "a musical instrument of ten or (acc. to J[osephus] AJ 7.12.3) of twelve strings, cj. in S[ophocles] fr.849, cf. LXX 1 Ki.10.5, al.:--also na/blas, -a, o(, Sopat[er fr.] 16, Philem[on fr.] 44, Str[abo] 10.3.17; cf. nau=lon I. (Semitic word, cf. Hebr. ֵבֶל nēbel; Phoenician, acc. to Ath[enaeus, Deipnosophists] 4.175B [= 4.77 Kaibel].)".
cf. psi 15.