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Colon (punctuation)

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A colon is a punctuation mark made of two equally sized dots. These dots are aligned vertically. It acts as a signal to the reader. It often introduces an explanation, a list, or a quotation. In many ways, the colon is a bridge between ideas. It connects a complete thought to the information that follows it. This makes the relationship between ideas clear and easy to follow.

Using a colon involves specific rules of structure. In modern English, a complete sentence must come before the colon. What follows the colon can be a list, a description, or a definition. It can also be another complete sentence. The elements after the colon might be a single word or a long list. For example, one might write: "Dinner: chips and juice." This shows how a colon directs attention to specific details.

Scholars have identified different ways to use this mark. Luca Serianni identified four main modes of the colon. The first is syntactical-deductive. This mode introduces the logical consequence of a fact. For instance, "There was only one explanation: the train had never arrived."

The second mode is syntactical-descriptive. This is used to list the elements of a set. It also separates hours, minutes, and seconds in time, such as 09:15:05. The third mode is appositive. This can separate a subtitle from a main title, like "Star Wars Episode VI: Return of the Jedi."

The final mode is segmental. This introduces speech, much like a dash or quotation marks. In scripts, it follows a character's name to show their lines.

The history of the colon is quite ancient. In Ancient Greek, the word "colon" meant a limb or a member of a body. It did not refer to punctuation at that time. In the 3rd century BC, Aristophanes of Byzantium is said to have created a punctuation system. He used a middot to mark a medium-length breath. Later, the term appeared in English. It was used in the 1589 book "The Arte of English Poesie." By 1622, it appeared in a print of William Shakespeare's "Othello."

Rules for capitalization vary by region. In British English, the word after a colon is usually lowercase. This remains true unless the word is a proper noun. In American English, writers often capitalize the first word after a colon if it is an independent clause. Some American guides, like the Associated Press, allow this. However, the Chicago Manual of Style says to capitalize only for direct quotes or questions. In German, writers always capitalize the independent clause following a colon.

Colons serve many technical purposes outside of literature. In mathematics, the colon represents a ratio, such as 3:1. This is read as "three to one." It can also be used in logic to show proportions. In some languages like German, Russian, and French, it is a sign for division. In sports, German and Hebrew use it to divide scores, such as 149 : 0. In the Bible or Quran, it separates chapters from verses, like "Isaiah 42:8."

Different cultures use the colon in unique ways. In Finnish and Swedish, it can appear inside words. It connects a suffix to an abbreviation or a digit. In written Swedish, it is used in contractions like "S:t" for "Sankt." In Ethiopia, the Ge'ez script used a colon-like mark to separate words.

Ethiopic genesis (ch. 29, v. 11-16), 15th century (The S.S. Teacher's Edition-The Holy Bible - Plate XII, 1)
Ethiopic genesis (ch. 29, v. 11-16), 15th century (The S.S. Teacher's Edition-The Holy Bible - Plate XII, 1)

This shows how the symbol has different roles across the world. From math to scripts, the colon is a versatile tool for communication.

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File:Ethiopic genesis (ch. 29, v. 11-16), 15th century (The S.S. Teacher's Edition-The Holy Bible - Plate XII, 1).jpg
Ethiopic genesis (ch. 29, v. 11-16), 15th...
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