Jig?

I just had to share this. I was cleaning up my workshop a bit today... sawdust gets everywhere. I decided to clean out the two cupboards beside my tablesaw where I keep dado blades, wood throat plate inserts, extra push sticks and jigs.

Well I found this.
 

Tape, screw in the middle, an angle cut on the end and about 15" long!

I have absolutely no idea what it is.

The joys of getting old!