The Red And Black X

Information
The Red and Black X has been spotted in various locations.
 * Zeb's "item" for Eli and Raen in Event #8 which was later analysed in Event #8.5
 * Eliza noticed it was marked on a post under Eli and Raen's house in Event #11

It is unknown what this symbol means or if it is connected to anything. The symbol has a red line followed by a shorter black line on top.