Hi George,
This variant is getting generated when you run the program in background through your selection screen.
By Opting the path - Program --> Execute in BackGround.
At that time, the system will generate automatically a runtime variant - '&0000000000001'. Next time if you run the system will increment the same and change the value to - '&0000000000002' and so on.
You can check the table VARI where system stores the data for variants. Run the programs in background and you can see the behaviour in this table.
Hope this helps.
Regards,
Abhi