The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, known as the NGC objects. It is one of the largest comprehensive catalogues, as it includes all types of deep space objects, including galaxies, star clusters, emission nebulae and absorption nebulae.
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NGC 6756
NGC 6756 is a small open star cluster in the constellation Aquila, close to NGC 6755.
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Sources:
Wikipedia Page: NGC 6756
NGC 6756 at In-The-Sky website