Actor Sheet Basic Icons - Genii-Locorum/aov GitHub Wiki
You may see some icons at the top right of a Character, NPC and Ship Actor Sheet (Farms are very different)
The padlock icon indicates if the character sheet is locked or not - Click on the icon to toggle the lock off and on. If the icon looks like a closed padlock then the sheet is locked, if it looks like an open padlock then the sheet is unlocked.
The chain icon indicates that the Prototype Token in the Actor's Directory has "link to actor" on, if there is a slash through the icon then it is unlinked. Please remember this is determined by the Prototype and not the token on a scene. Clicking the icon will not change this - use the usual Foundry functionality to make the change.
If you are looking at a a token from a scene and it is unlinked to the Actor then you will see a people icon - indicating that this is a synthetic (unlinked) actor. Clicking the icon will not change this - use the usual Foundry functionality to make the change.
On NPC sheets you will also see three icons under the NPC name. These are effectively tabs and clicking on them changes the information you can see on the NPC. Please refer to the NPC sheet for more information.