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  2. Crest and trough - Wikipedia

    en.wikipedia.org/wiki/Crest_and_trough

    A crest is a point on a surface wave where the displacement of the medium is at a maximum. A trough is the opposite of a crest, so the minimum or lowest point of the wave. When the crests and troughs of two sine waves of equal amplitude and frequency intersect or collide, while being in phase with each other, the result is called constructive ...

  3. Crest (heraldry) - Wikipedia

    en.wikipedia.org/wiki/Crest_(heraldry)

    A crest is a component of a heraldic display, consisting of the device borne on top of the helm. Originating in the decorative sculptures worn by knights in tournaments and, to a lesser extent, battles, crests became solely pictorial after the 16th century (the era referred to by heraldists as that of "paper heraldry").

  4. Heraldry - Wikipedia

    en.wikipedia.org/wiki/Heraldry

    The German Hyghalmen Roll was made in the late 15th century and illustrates the German practice of repeating themes from the arms in the crest. (See Roll of arms).. Heraldry is a discipline relating to the design, display and study of armorial bearings (known as armory), as well as related disciplines, such as vexillology, together with the study of ceremony, rank and pedigree.

  5. Mid-ocean ridge - Wikipedia

    en.wikipedia.org/wiki/Mid-ocean_ridge

    A team led by Marie Tharp and Bruce Heezen concluded that there was an enormous mountain chain with a rift valley at its crest, running up the middle of the Atlantic Ocean. Scientists named it the 'Mid-Atlantic Ridge'. Other research showed that the ridge crest was seismically active [45] and fresh lavas were found in the rift valley. [46]

  6. Wavelength - Wikipedia

    en.wikipedia.org/wiki/Wavelength

    Wavelength depends on the medium (for example, vacuum, air, or water) that a wave travels through. Examples of waves are sound waves, light, water waves and periodic electrical signals in a conductor. A sound wave is a variation in air pressure, while in light and other electromagnetic radiation the strength of the electric and the magnetic ...

  7. History of heraldry - Wikipedia

    en.wikipedia.org/wiki/History_of_heraldry

    19th-century German heraldry has examples of shields with numerous crests, as this arms of Saxe-Altenburg featuring a total of seven crests. Some thaler coins display as many as fifteen. Example of complex achievements in 19th-century Spanish heraldry : Coat of arms of Baldomero Espartero, Prince of Vergara (1793–1879).

  8. Blazon - Wikipedia

    en.wikipedia.org/wiki/Blazon

    For example, a shield divided azure and gules would be perfectly acceptable. A line of partition may be straight or it may be varied. The variations of partition lines can be wavy, indented, embattled, engrailed, nebuly , or made into myriad other forms; see Line (heraldry) .

  9. Crest (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Crest_(anatomy)

    Buccinator crest; A feature on various animals: Crest (feathers) Display feature or thermoregulatory feature in various reptiles; Sail (anatomy), also known as crest in some animals; The point of a horse's neck where the mane grows from; Neural crest, a temporary group of cells unique to vertebrates that arise from the embryonic ectoderm cell layer