Pleiades is a star cluster in the Taurus constellation. Six of its stars are visible to the naked eye, but about 250 bluish stars can be seen if one uses a telescope. In the West the cluster is called Pleiades, in Japan it goes by the name Mutsuraboshi. (Subaru the car maker gives a good history of the name, hence their logo.)
According to NASA the Pleiades contains over 3,000 stars and is about 400 light years away.