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Reticle accessory (PD-8) used in sniper rifles. A reticle, or reticule [1] [2] also known as a graticule, is a pattern of fine lines or markings built into the eyepiece of an optical device such as a telescopic sight, spotting scope, theodolite, optical microscope or the screen of an oscilloscope, to provide measurement references during visual ...
The crosshair is the most rudimentary reticle, represented as a pair of smooth, perpendicularly intersecting lines in the shape of a "+", and the crosshair center is used for aiming the weapon. The crosshair lines geometrically resemble the X- and Y-axis of the Cartesian coordinate system , which the shooter can use as a simple reference for ...
Anda. An Urdu language word meaning egg, for the pure-white uniform of traffic police in urban Pakistani areas like Karachi. Askar/Askari. A Somali term meaning “soldier” which is often used by Somali immigrants to the United Kingdom to refer to police. It is commonly used by rappers in UK drill. Aynasız.
Fiducial marker. A ruler used as a fiducial marker. A fiducial marker or fiducial is an object placed in the field of view of an image for use as a point of reference or a measure. It may be either something placed into or on the imaging subject, or a mark or set of marks in the reticle of an optical instrument.
Stadia marks on a crosshair while viewing a metric levelling rod. The top mark is at 1.500 m and the lower is at 1.345 m. The difference between the rod readings is 0.155 m, yielding a distance to the rod of 15.5 m. A typical surveyor's instrument reticle has two pairs of stadia marks. One pair are on the horizontal centreline and the other on ...
A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to measure height differences ...
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Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing. This list includes abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies. Technical standards exist to provide glossaries of ...