At the top of the WHAT IS IT page, you will see a post called:
PLEASE READ BEFORE POSTING ITEMS IN "WHAT IS IT?"
Here is what it says:
Ihyn,
Creskol gave you some sound advice.
Give a little more info to go on...
Clean it up a bit better
Clear focused well and lit pictures
See if there is any backmark or evidence of a shank
Tell us what it is made of
A little better idea of where it was found... yard sale, field or a friend gave it to you...
These are all things that help us help you !!
Any way it doesn't look like a button to me, but what do I know...