Dashicons is the official icon font of the WordPress admin as of 3.8. — NSV 12.7 UTYOS

Dashicons is the official icon font of the WordPress admin as of 3.8.

For any issues that appear within WordPress core, please create a new ticket on trac. Use the “administration” component and the “UI” focus when creating the new ticket, and be sure to include “Dashicons” somewhere in the text of the ticket.