Semicolonwikipedia
The semicolon or semi colon is a punctuation mark that separates major sentence elements.
semicolon;؛semi-colon Semicolon [;] semi-colonspartial stop&#x3b;

Full stop

full stopperiod.
Although terminal marks (i.e. full stops, exclamation marks, and question marks) mark the end of a sentence, the comma, semicolon and colon are normally sentence-internal, making them secondary boundary marks.
The "middle dot" ⟨·⟩, the stigmḕ mésē, marked a division in a thought occasioning a longer breath (essentially a semicolon) and the low dot ⟨.⟩, called the hypostigmḕ or "underdot", marked a division in a thought occasioning a shorter breath (essentially a comma).

Question mark

question mark????
Although terminal marks (i.e. full stops, exclamation marks, and question marks) mark the end of a sentence, the comma, semicolon and colon are normally sentence-internal, making them secondary boundary marks.
It was adopted by Church Slavonic and eventually settled on a form essentially similar to the Latin semicolon.

Comma

comma,commas
Although terminal marks (i.e. full stops, exclamation marks, and question marks) mark the end of a sentence, the comma, semicolon and colon are normally sentence-internal, making them secondary boundary marks.
If the individual items of a list are long, complex, affixed with description, or themselves contain commas, semicolons may be preferred as separators, and the list may be introduced with a colon.

Colon (punctuation)

colon:colons
Although terminal marks (i.e. full stops, exclamation marks, and question marks) mark the end of a sentence, the comma, semicolon and colon are normally sentence-internal, making them secondary boundary marks.
(This was only intermittently used, but eventually revived as the ano teleia, the modern Greek semicolon.

Serial comma

serial commaOxford commaprecedes the final item

Punctuation

punctuationpunctuation markpunctuation marks
The semicolon or semi colon is a punctuation mark that separates major sentence elements.
They have been credited with popularizing the practice of ending sentences with the colon or full stop, inventing the semicolon, making occasional use of parentheses and creating the modern comma by lowering the virgule.

C (programming language)

CC programming languageC language
In other languages, semicolons are called terminators and are required after every statement (such as in Java, and the C family).
C program source text is free-format, using the semicolon as a statement terminator and curly braces for grouping blocks of statements.

Interpunct

interpunctmiddle dotano teleia
To indicate a long pause or separate sections, each with commas (the semicolon's purpose in English), Greek uses, but extremely rarely, the "άνω τελεία", an interpunct .
The modern Greek ano teleia mark (άνω τελεία, ánō teleía, lit. "upper stop"), also known as the áno stigmī́, is the infrequently-encountered Greek semicolon and is properly romanized as such.

SQL

Structured Query LanguageSQLSQL Databases
In computer programming, the semicolon is often used to separate multiple statements (for example, in Perl, Pascal, PL/I, and SQL; see Pascal: Semicolons as statement separators).

Comma operator

comma operatoroperator
Of these other characters, whereas commas have continued to be widely used in programming for lists (and rare other uses, such as the comma operator that separates expressions in C), they are rarely used otherwise, and the period as the end of the program has fallen out of use.
The comma operator separates expressions (which have value) in a way analogous to how the semicolon terminates statements, and sequences of expressions are enclosed in parentheses analogously to how sequences of statements are enclosed in braces: is a sequence of expressions, separated by commas, which evaluates to the last expression while is a sequence of statements, and does not evaluate to any value.

INI file

INIini file.ini
Other languages (for instance, some assembly languages and LISP dialects, CONFIG.SYS and INI files) use semicolons to mark the beginning of comments.
Semicolons at the beginning of the line indicate a comment.

Project Semicolon

Project Semicolon is the name of a faith-based anti-suicide initiative (since the semicolon continues a sentence rather than ending it) which has led to the punctuation mark becoming a highly symbolic and popular tattoo.
They have been known for encouraging people to tattoo the punctuation mark semicolon onto their bodies as a form of solidarity between people dealing with mental illness or death of someone from suicide.

Pascal (programming language)

PascalPascal programming languagePascal Language
In computer programming, the semicolon is often used to separate multiple statements (for example, in Perl, Pascal, PL/I, and SQL; see Pascal: Semicolons as statement separators).
Semicolons separate statements, and the full stop (i.e., a period) ends the whole program (or unit).

Duodecimal

duodecimalbase 1212
The Humphrey point is sometimes used instead of a decimal point in duodecimal numbers.
They include italicizing duodecimal numbers (54 = 64), adding a "Humphrey point" (a semicolon ";" instead of a decimal point ".") to duodecimal numbers (54; = 64.) (54;0 = 64.0), or some combination of the two.

Covariant derivative

covariant derivativecovariant differentiationcovariant differential
In differential geometry, a semicolon preceding an index is used to indicate the covariant derivative of a function with respect to the coordinate associated with that index.
Often a notation is used in which the covariant derivative is given with a semicolon, while a normal partial derivative is indicated by a comma.

CSV application support

CSV
The comma-separated values file format is a very simple data file format that is supported by almost all spreadsheet software such as Excel (although Excel uses the list separator of the current locale settings, which is a semicolon instead of a comma for many locales), Apple Numbers, OpenOffice.org Calc and Gnumeric as well as many online spreadsheet services such as EditGrid and Google Docs & Spreadsheets.

Mixed radix

mixed radixmixed-radixPrimorial number system
In the tabular format, the digits are written above their base, and a semicolon indicates the radix point.

Portuguese orthography

Portugueseorthography of Portugueseextensive set of rules
For letters with more than one common pronunciation, their most common phonetic values are given on the left side of the semicolon; sounds after it occur only in a limited number of positions within a word.

Ancient Greek grammar

Ancient GreekgrammarGreek
Two punctuation marks are used in Greek texts which are not found in English: the colon, which consists of a dot raised above the line ( · ) and the Greek question-mark, which looks like the English semicolon ( ; ).

Slovene punctuation

Marks used in Slovene include full stops, question marks, exclamation marks, commas, semicolons, colons, dashes (–), hyphens, ellipses, different types of inverted commas and quotation marks, brackets (which are in syntactical use), as well as apostrophes, solidi, equal signs, and so forth.

List (abstract data type)

listlistsordered lists
A list can often be constructed by writing the items in sequence, separated by commas, semicolons, and/or spaces, within a pair of delimiters such as parentheses '', brackets '[]', braces '{}', or angle brackets ''.

Eats, Shoots & Leaves

Eats, Shoots & Leaves: The Zero Tolerance Approach to Punctuationeats, shoots and leaves
There is one chapter each on apostrophes; commas; semicolons and colons; exclamation marks, question marks and quotation marks; italic type, dashes, brackets, ellipses and emoticons; and the last one on hyphens.