A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name.
Cancer is one of the twelve constellations of the zodiac.
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
Delta Cancri (δ Cancri, abbreviated Delta Cnc, δ Cnc) is a double star approximately 180 light-years from the Sun in the constellation of Cancer.
A star system or stellar system is a small number of stars that orbit each other, bound by gravitational attraction.
20 Cancri (20 Cnc, d1 Cancri, d1 Cnc) is a star in the constellation Cancer.
25 Cancri (25 Cnc, d2 Cancri, d2 Cnc) is a star in the constellation Cancer.