M80 Stiletto from the Italian Stiletto, a long and narrow knife or dagger. The Stiletto's unusual shape and patented M-hull provides a stable yet fast platform for mounting electronic surveillance equipment or weapons, or for conducting special operations. The hull design does not require foils or lifting devices to achieve a smooth ride at high speeds in rough conditions. Its shallow draft means the M80 Stiletto can operate in littoral and riverine environments and potentially allows for beach landings. The faceted design suggests that the vessel has a low radar signature (i.e., stealth) in the frontal aspect and somewhat so from the
Heel-shaped cairn Heel-shaped cairn The heel-shaped cairn, with its usually cruciform chamber, is a type of megalithic monument that is found in Scotland, especially in Caithness and Sutherland and on the Shetland Islands. On Orkney, the Isbister Cairn is the only site that is similar in shape. The chambers usually lie in a round cairn made of broken rocks, which either contemporaneously or later were surrounded by the eponymous platform, up to 20 metres wide at the front and from 1.0 to 1.5 metres high, and were partly enclosed by large kerbstones. A gentle concave exedra is characteristic of the front face.