Dunbar's number

== English == === Alternative forms === Dunbar number === Etymology === Proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation between primate brain size and average social group size. === Proper noun === Dunbar's number A suggested cognitive limit to the number of people with whom one can maintain stable social relationships. It has been proposed to lie between 100 and 250, with a commonly used value of 150.