Suppose if a bottle broke such that its head shattered but the bottom survived, something similar to in this image. I'm referring to such a shard(??) in my sentence but am not able to come up with an appropriate word to represent it.
e.g. sentence - Squatting, he picked up the broken remains of the bottle and raised the __________ as if making a toast
Searching has yielded the following options - cracked heel, shard, fragment but they do not feel fitting as they do not conjure that image. Is there a specific term that can be used ?