The US House of Representatives has its own ceremonial mace, which was apparently one of the first things that they authorized once they met for the first time. However, the Senate does not seem to have an equivalent. It has a gavel, which fills a similar (albeit much less impressive) niche, but as far as I can tell, the gavel acquired its importance from the fact it has been used for so long.
Why did the early Senate not authorize a mace for itself? Was it even discussed?