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Alphanumericals or alphanumeric characters are a combination of alphabetical and numerical
Alphanumericals or alphanumeric characters are a combination of alphabetical and numerical character
Character or Characters may refer to:
Arts, entertainment, and media Literature
* ''Character'' (novel), a 1936 Dutch novel by Ferdinand Bordewijk
* ''Characters'' (Theophrastus), a classical Greek set of character sketches attributed to The ...
s. More specifically, they are the collection of Latin letters and Arabic digits. An alphanumeric code is an identifier
An identifier is a name that identifies (that is, labels the identity of) either a unique object or a unique ''class'' of objects, where the "object" or class may be an idea, physical countable object (or class thereof), or physical noncountable ...
made of alphanumeric characters.
Merriam-Webster
Merriam-Webster, Inc. is an American company that publishes reference books and is especially known for its dictionaries. It is the oldest dictionary publisher in the United States.
In 1831, George and Charles Merriam founded the company as ...
suggests that the term "alphanumeric" may often additionally refer to other symbols, such as punctuation and mathematical symbols.
In the POSIX/C locale, there are either 36 (A–Z and 0–9, case insensitive) or 62 (A–Z, a–z and 0–9, case-sensitive) alphanumeric characters.
Subsets of alphanumeric used in human interfaces
When a string of mixed alphabets and numerals is presented for human interpretation, ambiguities arise. The most obvious is the similarity of the letters I, O and Q to the numbers 1 and 0. Therefore, depending on theapplication
Application may refer to:
Mathematics and computing
* Application software, computer software designed to help the user to perform specific tasks
** Application layer, an abstraction layer that specifies protocols and interface methods used in a c ...
, various subset
In mathematics, Set (mathematics), set ''A'' is a subset of a set ''B'' if all Element (mathematics), elements of ''A'' are also elements of ''B''; ''B'' is then a superset of ''A''. It is possible for ''A'' and ''B'' to be equal; if they are ...
s of the alphanumeric were adopted to avoid misinterpretation by humans.
In passenger aircraft, aircraft seat map
An aircraft seat map or seating chart is a diagram of the seat layout inside a passenger airliner. They are often published by airlines for informational purposes and are of use to passengers for selection of their seat at booking or check-in.
...
s and seats were designated by row number followed by column letter. For wide bodied jets, the seats can be 10 across, labeled ABC-DEFG-HJK. The letter I is skipped to avoid mistaking it as row number 1. In Vehicle Identification Number used by motor vehicle manufacturers, the letters I, O and Q are omitted for their similarity to 1 or 0.
Tiny embossed letters are used to label pins on an V.35/M34 electrical connector. The letters I, O, Q, S, and Z were dropped to ease eye strain with 1, 0, 5, 3,and 2. That subset is named the DEC Alphabet after the company that first used it.
For alphanumerics that are frequently handwritten, in addition to I and O, V is avoided because it looks like U in cursive, and Z for its similarity to 2.
See also
*Alphanumeric brand names An alphanumeric brand name is a brand name composed only of letters and numbers (alphanumericals). Examples include 7 Up, Saks Fifth Avenue, Audi A4, Canon A75. They may serve as abbreviations (e.g. 3M, formerly known as the Minnesota Mining and M ...
* Alphanumeric shellcode
In hacking, a shellcode is a small piece of code used as the payload in the exploitation of a software vulnerability. It is called "shellcode" because it typically starts a command shell from which the attacker can control the compromised mac ...
* Alphanumeric keyboard
The technology of computer keyboards includes many elements. Among the more important of these is the switch technology that they use. Computer alphanumeric keyboards typically have 80 to 110 durable switches, generally one for each key. The ch ...
* Binary-to-text encoding
* Mathematical Alphanumeric Symbols
References
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