In Greek mythology, the seven daughters of the giant Atlas who asked to be changed into a cluster of stars to escape the pursuit of the hunter Orion.

In astronomy, a star cluster about 400 light-years away in the constellation Taurus, representing the Seven Sisters of Greek mythology. Its brightest stars (highly luminous, blue-white giants only a few million years old) are visible to the naked eye, but there are many fainter ones.
The stars of the Pleiades are still surrounded by traces of the reflection nebula from which they formed, visible on long-exposure photographs.

1. (Greek mythology) 7 daughters of Atlas and half-sisters of the Hyades; placed among the stars to save them from the pursuit of Orion.
2. A star cluster in the constellation Taurus.