Refers to the star cluster or a group of notable people.
La pleyade de estrellas brillaba intensamente en la noche despejada.
The Pleiades of stars shone brightly in the clear night.
En la noche despejada, pudimos ver la pleyade brillar en el cielo estrellado.
On the clear night, we could see the Pleiades shining in the starry sky.