Anchor
An anchor is a device, normally made of metal, used to connect a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin "ancora", which itself comes from the Greek ἄγκυρα ("ankura").
History of the anchor
Killicks are primitive anchors formed by lashing tree branches to a stone for weight. Greeks were using mushroom anchors by 400 B.C. fashioned from a flattened stone with a hole drilled through the center and a triangular eyebolt at the crown for "tripping" the anchor out of its bed.