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  2. Designation of workers by collar color - Wikipedia

    en.wikipedia.org/wiki/Designation_of_workers_by...

    Gray collar – Refers to labor which blurs the line between blue- and white-collar work. Gray collar work requires both physical and intellectual labour, and may require specialized training or college degrees. Commonly given examples of gray collar workers are first responders, electricians, nurses, technicians, conservationists, and pilots ...

  3. Shock collar - Wikipedia

    en.wikipedia.org/wiki/Shock_collar

    A typical shock collar. Shock collar used on a riot police dog in 2004 in Würzburg.Two years later, [1] Germany banned the use of shock collars, even by police. [2]A shock collar or remote training collar, also known as an e-collar, Ecollar, or electronic collar, is a type of training collar that delivers shocks to the neck of a dog [3] to change behavior.

  4. Dog collar - Wikipedia

    en.wikipedia.org/wiki/Dog_collar

    A dog collar is a piece of material put around the neck of a dog. A collar may be used for restraint, identification, fashion, protection, or training (although some aversive training collars are illegal in many countries [1] [2]). Identification tags and medical information are often placed on dog collars. [3]

  5. Bosonic field - Wikipedia

    en.wikipedia.org/wiki/Bosonic_field

    In quantum field theory, a bosonic field is a quantum field whose quanta are bosons; that is, they obey Bose–Einstein statistics.Bosonic fields obey canonical commutation relations, as distinct from the canonical anticommutation relations obeyed by fermionic fields.

  6. Clerical collar - Wikipedia

    en.wikipedia.org/wiki/Clerical_collar

    The term Roman collar is equivalent to "clerical collar" and does not necessarily mean that the wearer is Roman Catholic. [ 15 ] In the late nineteenth century and early twentieth century, non-Christian clergy, such as some Jewish rabbis in England (such as Rabbi Abraham Cohen , the editor of the Soncino Books of the Bible ) would also wear ...

  7. Middle Ages - Wikipedia

    en.wikipedia.org/wiki/Middle_Ages

    Middle Ages c. AD 500 – 1500 A medieval stained glass panel from Canterbury Cathedral, c. 1175 – c. 1180, depicting the Parable of the Sower, a biblical narrative Including Early Middle Ages High Middle Ages Late Middle Ages Key events Fall of the Western Roman Empire Spread of Islam Treaty of Verdun East–West Schism Crusades Magna Carta Hundred Years' War Black Death Fall of ...

  8. Collar (clothing) - Wikipedia

    en.wikipedia.org/wiki/Collar_(clothing)

    Cape collar: A collar fashioned like a cape and hanging over the shoulders. Chelsea collar: A woman's collar for a low V-neckline, with a stand and long points, popular in the 1960s and 1970s. Clerical collar: A band collar worn as part of clerical clothing. Convertible collar: A collar designed to be worn with the neck button either fastened ...

  9. Timeline of United States inventions (before 1890) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    1827 Detachable collar. A detachable collar is a collar separate from the shirt, fastened to the shirt by studs. Hannah Lord Montague invented the detachable collar in Troy, New York, in 1827, after she snipped the collar off one of her husband's shirts to wash it, and then sewed it back on. [60] 1829 Graham cracker. A stack of graham crackers