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mass of ice that has become detached, or calved, from the edge of an ice sheet or glacier and is floating on the ocean. Because ice is slightly less dense than water about one ninth of the total mass of a berg projects above the water. Greenland and other N Atlantic icebergs are usually peaked and irregular in shape; Antarctic icebergs are tabular, with flat tops and steep sides, and are sometimes extremely large when calved from an ice shelf. Icebergs differ from other ocean ices: sea ice is formed directly from the freezing of ocean water; pack ice is tightly packed fragments of sea ice; ice floes are small, floating ice fragments that separate from pack ice; and fast ice is ice attached to a shore.

Greenland is the source of most of the icebergs in the N Atlantic, where the iceberg season lasts roughly from February to October. As a consequence of the loss of the Titanic through collision with an iceberg in 1912, a patrol of N Atlantic shipping channels was initiated in 1914 by the international agreement of 16 nations. Patrols use planes and surface vessels equipped with radar, loran, and underwater sound equipment. A constant census of bergs is maintained, and the location of an iceberg is reported to any ship in its vicinity.

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A large mass of glacial ice broken off and drifted from parent glaciers or ice shelves along polar seas; it is distinguished from polar pack ice, which is sea ice, and from frozen seawater, whose rafted or hummocked fragments may resemble small icebergs.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a large mass of ice floating in the sea, esp a mass that has broken off a polar glacier
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
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Slice all at Once sends the sub-orders to the exchange one after the other all at once; Ice-berg forwards the sub-orders one after the other when the previous sub-order is filled; Sliced Interval sends sub-orders one after the other with a delay in between as specified by the user; and Sliced at Interval Ice Berg sends sub-orders one after the other when previous sub order is filled and after a delay specified by the user.
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We believe this is probably just the tip of the ice berg.