A set of custom vector icons designed specifically for elementary OS third party applications. These icons are licensed openly under the terms of the GNU General Public License.
Download and extract zip file. Run install.sh as normal user. Do not run this file as root. Insert admin password when asked by the script:
./install.sh
[sudo] password for {username}:
Output:
#---------------------------------------------#
# Extra Icons for elementary OS #
#---------------------------------------------#
[I] This part of the script is running as root.
Answer Y to the following question:
[?] Would you like to install the Extra Icons for elementary OS? (Y)es, (N)o: Y
Success:
[1] Making dir...
[2] Copying icon theme...
[OK] Extra Icons for elementary OS have been instaled.
[I] This part of the script is running as normal user.
[3] Changing icon theme from 'elementary-extra' to 'elementary-extra'...
[OK] Success.