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The lowercase "a" and uppercase "A" are the two case variants of the first letter in the English alphabet.. In computers, case sensitivity defines whether uppercase and lowercase letters are treated as distinct (case-sensitive) or equivalent (case-insensitive).
Sigma (/ ˈ s ɪ ɡ m ə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Ancient Greek: σίγμα) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for summation.
uppercase letters small caps: ʙ ɢ ʛ ʜ ɪ ʟ 𝼄 ɴ ɶ ʀ ʏ: often mistaken by typing, uppercase alternatives to symbols shaped like small capitals ꞯ small capital q: pharyngeal stop: ʡ: proposed for the pharyngeal stop of Formosan languages, ExtIPA for same purpose. ꞯ small capital q: sokuon: used by Japanologists. Q: capital Q ...
The x must be lowercase in XML documents. The nnnn or hhhh may be any number of digits and may include leading zeros. The hhhh may mix uppercase and lowercase, though uppercase is the usual style. In contrast, a character entity reference refers to a character by the name of an entity which has the desired character as its replacement text.
Uppercase and lowercase Greek letter sigma, from the times.ttf font included with standard XOrg X Windows installations. Intended to replace Image:Sigma.png . Category:Greek letters
(uppercase) represents: an asymptotically tight bound related to big O notation. sensitivity to the passage of time in mathematical finance; in set theory, a certain ordinal number; Heaviside step function (lowercase) represents: a plane angle in geometry
A character encoding form (CEF) is the mapping of code points to code units to facilitate storage in a system that represents numbers as bit sequences of fixed length (i.e. practically any computer system). For example, a system that stores numeric information in 16-bit units can only directly represent code points 0 to 65,535 in each unit, but ...
During the Renaissance, the printing convention was to use I (upper case) and i (lower case) for both vocalic /i/ and consonantal /j/, to use V in the upper case and in the lower case to use v at the start of words and u subsequently within the word regardless of whether /u/ and /w/ was represented. [64]