Clan mark is a sign given by the clan leader or R4 to mark something. The marks that have been created will be visible to clan members.
Usually used to mark outposts you want to build and protect, the target you want to attack, marking the enemy’s danger etc.
How to make a clan mark
Click the base or building you want to highlight, then click the blue icon next to the star icon.
Select icons like skull, cat, shield, ax, hat, etc. Don’t forget to write a message. The message will appear below the mark