I'm pretty sure this is a burner head from an old stove, or something like that, with its little holes all along the points of the star on one side for releasing gas--as well as a mark on it with the word "Gas"! I just think it's a great object, like a sculptural finial with a good old rusty surface to boot, good for slipping over a post or hanging on the wall.
9" tall x 4 7/8" wide x 1 5/8" deepest. Very good condition with some rusting that just makes it better.