Why are these called 5 way binding posts? I count four!

These are the five ways:

1) bar wire (either around the post or through the hole in the post)

2) spade lug

3) pin jack (solid metal pin at the end of the wire to go into that hole in the post)

4) banana jack

5) double banana jack (the positive and negative posts can be spaced apart by a standard distance such that the two banana jacks are fixed in a holder that has them spaced accordingly).

There are some amusing answers here, but, my earlier posting was not speculation-this is what I was told by the distributor of binding posts.  He loved to test people on this because few actually know.  I got four right—bare wire, spade lug, banana jack and pin jack—but I did not guess double banana (or dual banana) jack.  I like the alligator clip idea.  Perhaps someone can claim their product is a six-way binding post, or even more.  At least this would have some basis in fact, unlike the cell phone companies claiming “10 k” coverage (10 is bigger than 5, right? Never mind that 5k denoted the generation of development).