The colored dots refer to languages with gendered pronouns, but there are more than one kind, as indicated by the Values key. The number on the right indicates how many languages fit into each group. Notice that the majority of languages represented here (57 percent) do not have gendered pronouns.
The map at the site is interactive. Go there to click on those dots and explore.
Wade, Lisa. 2014. “The Majority of Languages Do Not Have Gendered Pronouns”. Pacific Standard Magazine. Posted: October 17, 2014. Available online: http://www.psmag.com/navigation/books-and-culture/majority-languages-gendered-pronouns-92638/