The snuffer idea is good, but I just wanted to mention that it resembles a copula or turrent roof cap (my first guess/thought at first glance, anyway, so I went to find one)... or a weathervane tip.
Here's a close resemblance:
(Go check this site out: http://statuary-weathervane.com/)
Here's a close resemblance:
(Go check this site out: http://statuary-weathervane.com/)