There's a rich assortment of symbols in graveyards, generally relating to the end of life. This is just a small batch of pictures; others will follow eventually.
From Middleville Cemetery in Middleville, NY:
From two faces of one obelisk, a broken chain and a bundle of wheat with a sickle:
This elegant obelisk sports an upside-down torch:
From Jamesville Walnut Grove Cemetery in Jamesville, NY:
Another obelisk, another sheaf of wheat with a sickle:
A long-view of the obelisk's point with its detailed drapery and tassels:
This headstone is modeled after a simple door with carved surround:
From DeWitt Cemetery in DeWitt, NY:
The epitaph reads simply "Our little infant" and depicts a hand releasing a dove into the air.
From Oakwood Cemetery in Syracuse, NY:
This sort-of crest was actually carved on the back of the headstone and, as you can see from the picture, close to the ground-- not a prominent decoration at all.