Which specific, famous grouping is identified as a textbook example of an Open Cluster?

Answer

The Pleiades, also known as the Seven Sisters.

The Pleiades, frequently referred to by its alternate name, the Seven Sisters, is highlighted in the material as a textbook example illustrating the characteristics of a young, loosely arranged open cluster. Although only seven stars are easily visible to the naked eye, the group contains a much larger stellar population, yet it remains relatively sparse when compared to larger celestial configurations. While the Hyades are also mentioned as an excellent target, the Pleiades holds the specific designation as the primary visual exemplar of this type of stellar grouping.

Which specific, famous grouping is identified as a textbook example of an Open Cluster?
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