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In sports, a hash mark or hash line is a short line/bar marking that is painted perpendicular to the sidelines or side barricades, used to help referees and players recognize on-field locations and visually measure distances. Hash marks serve the same function as the graduated markings on measuring tools such as rulers.
It is also called sharp-exclamation, sha-bang, [1] [2] hashbang, [3] [4] pound-bang, [5] [6] or hash-pling. [ 7 ] When a text file with a shebang is used as if it were an executable in a Unix-like operating system, the program loader mechanism parses the rest of the file's initial line as an interpreter directive .
The symbol # is known variously in English-speaking regions as the number sign, [1] hash, [2] or pound sign. [3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔ .
Hatch marks (also called hash marks or tick marks) are a form of mathematical notation. They are used in three ways as: Unit and value marks — as on a ruler or number line; Congruence notation in geometry — as on a geometric figure; Graphed points — as on a graph; Hatch marks are frequently used as an abbreviation of some common units of ...
Tally marks, also called hash marks, are a form of numeral used for counting. They can be thought of as a unary numeral system . They are most useful in counting or tallying ongoing results, such as the score in a game or sport, as no intermediate results need to be erased or discarded.
A hash function that allows only certain table sizes or strings only up to a certain length, or cannot accept a seed (i.e. allow double hashing) is less useful than one that does. [citation needed] A hash function is applicable in a variety of situations. Particularly within cryptography, notable applications include: [8]
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The hash marks are painted so that the edge farthest from the sideline is the required distance from the sideline. In the NFL and most forms of indoor football, the hash marks are in line with the goalposts. College and high school football fields have hash marks that are significantly wider than the goal posts.