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 254
NGC 254 is a lenticular galaxy located in the constellation Sculptor. It was discovered by John Herschel in 1834. It is in a galaxy group with NGC 134. NGC 254 is an example of a ring galaxy, a galaxy with a ring, and in this case, no central bar. Across the entire galaxy disk, there is a disk of ionized gas rotating in the direction opposite the stellar disk's rotation. This situation may have arose when a retrograde-orbiting satellite galaxy accreted onto the galaxy itself, some 1 billion years ago.
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Wikipedia Page: NGC 254
NGC 254 at In-The-Sky website