Could someone happen to know what this ''X'' means?

[jiggypcb]

Hi, I have this symbol "X" on my diode footprint. I checked that it is not the origin or any error from design rules. I wonder if anyone has encountered this?

[Alex]

The X symbol means center of a group. Accidentally or intentionally you created a group consisting of the footprint and other objects ( shapes for example).

[jiggypcb]

Thank you. That solves the mystery that has been bugging me!