Brightest cluster galaxy

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What Wikipedia says

A brightest cluster galaxy (BCG) is defined as the brightest galaxy in a cluster of galaxies. BCGs include the most massive galaxies in the universe.

Excerpt from the Wikipedia article “Brightest cluster galaxy”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, ESA, and The Hubble Heritage Team (STScI/AURA); J. Blakeslee (Washington State University), Public domain, via Wikimedia Commons.