can buoy

from the GNU version of the Collaborative International Dictionary of English.

• See under buoy, n.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun nautical a truncated conical buoy, normally painted red and white, and numbered with even numbers, used to show the port side of a channel; the starboard side is marked with a conical buoy

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a buoy with a round bottom and conical top