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HARPS (High Accuracy Radial Velocity Planet Searcher) is a spectrograph with an echelle grating in the ESO 3.6m Telescope at La Silla Observatory (LSO) in Chile. It is designed for the radial velocity method, with a combination of spectral resolution and ability to detect very small wavelength differences that make it capable of detecting radial-velocity differences down to 1 meter per second. It began operation in 2003 and is credited with discovering at least 130 extra-solar planets. HARPSpol is a term for HARPS using its polarimeter feature. The HARPS M dwarf sample is a astronomical catalog of about 400 M dwarfs used for a study.
HARPS-N is a copy of HARPS on the Telescopio Nazionale Galileo in the northern hemisphere, which began operation in 2012, and HARPS3 is an improved version being installed on the Isaac Newton Telescope.