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!