Nabla may refer to any of the following: * the nabla symbol ∇ ** the vector differential operator, also called del, denoted by the nabla * Nabla, tradename of a type of rail fastening system (of roughly triangular shape) * ''Nabla'' (moth), a genus of moths * Nabla (instrument), the Greek word for a Phoenician stringed instrument after the triangular shape of which all of the above are named, reported as "nebel/nevel" in Hebrew sources. * Ranjan Daimary or D. R. Nabla, an Indian militant

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