Atgeir Atgeir An atgeir, sometimes called a "mail-piercer" or "hewing-spear," was a type of polearm in use in Viking Age Scandinavia and Norse colonies in the British Isles and Iceland. It is usually translated in English as "halberd", but most likely closer resembled a bill or glaive during the Viking age. Another view is that the term had no association with a specific weapon until it is used as an anachronism in saga literature to lend weight to accounts of special weapons. Later the word was used for typical European halberds, and even later multipurpose staves with spearheads were called "atgeirsstafir".
Radar configurations and types Radar configurations and types Radar configurations and types is an article about listing the different uses of radars. Radar come in a variety of configuration in the emitter, the receiver, the antenna, wavelength, scan strategies, etc. Search radars scan great volumes of space with pulses of short radio waves. They typically scan the volume two to four times a minute. The waves are usually less than a meter long. Ships and planes are metal, and reflect radio waves. The radar measures the distance to the reflector by measuring the time of the roundtrip from emission of a pulse to reception,