Alphanumericals
{{Short description|Set of alphabetic and numeric characters}}
{{Multiple issues|
{{more citations needed|date=May 2012}}
{{Confusing|article|date=October 2023}}
}}
{{Wiktionary|alphanumeric|alphanumerical}}
File:Skrattmås - (Larus ridibundus) - Ystad-2020.jpg ringed with an alphanumeric plastic ring that makes it easier to read from a distance.]]
Alphanumericals or alphanumeric characters are any collection of number characters and letters in a certain language. Sometimes such characters may be mistaken one for the other.
Merriam-Webster suggests that the term "alphanumeric" may often additionally refer to other symbols, such as punctuation and mathematical symbols.{{cite encyclopedia |url=http://www.merriam-webster.com/dictionary/alphanumeric |dictionary=Merriam-Webster dictionary |title=Alphanumeric |access-date=9 May 2020 |publisher=Merriam-Webster}}
In the POSIX/C{{Cite web |url=http://unixhelp.ed.ac.uk/CGI/man-cgi?ascii+7 |title=man ASCII(7), "American Standard Code for Information Interchange" |access-date=7 May 2013 |archive-url=https://web.archive.org/web/20130511022612/http://unixhelp.ed.ac.uk/CGI/man-cgi?ascii+7 |archive-date=11 May 2013 |date=1 April 2004 |work=UNIXhelp |publisher=University of Edinburgh |first=Panagiotis |last=Christias}} 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.{{Cite journal|last=Grissinger|first=Matthew|date=December 2012|title=Avoiding Confusion With Alphanumeric Characters|journal=Pharmacy and Therapeutics|volume=37|issue=12|pages=663–665|issn=1052-1372|pmc=3541865|pmid=23319841}} Therefore, depending on the application, various subsets of the alphanumeric were adopted to avoid misinterpretation by humans.
In passenger aircraft, aircraft seat maps 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 numbers 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
References
{{Reflist}}