Colon (punctuation) in the context of Label (computer science)

A smiley, also known as a smiley face, is a basic ideogram representing a smiling face. Since the 1950s, it has become part of popular culture worldwide, used either as a standalone ideogram or as a form of communication, such as emoticons. The smiley began as two dots and a line representing eyes and a mouth. More elaborate designs emerged in the 1950s, featuring noses, eyebrows, and outlines. New York radio station WMCA used a yellow and black design for its "Good Guys!" campaign in the early 1960s. More yellow-and-black designs appeared in the 1960s and 1970s, including works by Harvey Ross Ball in 1963, and Franklin Loufrani in 1971. The Smiley Company, founded by Franklin Loufrani, claims to hold the rights to a version of the smiley face in over 100 countries. It has become one of the top 100 licensing companies globally.

There was a "smile face" fad in 1971 in the United States. The Associated Press (AP) ran a wirephoto showing Joy P. Young and Harvey Ball holding the design of the smiley and reported on September 11, 1971, that "two affiliated insurance companies" claimed credit for the symbol and Harvey Ball designed it; Bernard and Murray Spain claimed credit for introducing it to the market. This referred to the Worcester Mutual Fire Insurance Company of America and the Guarantee Mutual Assurance Company of America, whose 1963 "Smile Power" campaign first distributed smiley buttons to employees. In October 1971, Loufrani trademarked his design in France while working as a journalist for the French newspaper France-Soir.Today, the smiley face has evolved from an ideogram into a template for communication and use in written language. The internet smiley originated with Scott Fahlman in the 1980s, when he first theorized that ASCII characters could be used to create faces and convey emotions in text. Since then, Fahlman's designs have become digital pictograms known as emoticons. They are loosely based on the ideograms designed in the 1960s and 1970s, continuing with the yellow and black design.

In computing, a delimiter is a character or a sequence of characters for specifying the boundary between separate, independent regions in data such as a text file or data stream. For context, data boundaries can be indicated via other means. For example, declarative notation indicates the length of a field at the start of the field instead of relying on delimiters.

In mathematics, delimiters are often used to specify the scope of an operation in an expression, and can occur both as isolated symbols (e.g., colon in "${\displaystyle 1:4}$") and as a pair of opposing-looking symbols (e.g., angled brackets in ${\displaystyle \langle a,b\rangle }$).

A macron (/ˈmækrɒn, ˈmeɪ-/ MAK-ron, MAY-) is a diacritical mark: it is a straight bar ¯ placed above a letter, usually a vowel. Its name derives from Ancient Greek μακρόν (makrón) 'long' because it was originally used to mark long or heavy syllables in Greco-Roman metrics. It now more often marks a long vowel. In the International Phonetic Alphabet, the macron is used to indicate a mid-tone; the sign for a long vowel is instead a modified triangular colon ⟨ː⟩.

The opposite is the breve ⟨˘⟩, which marks a short or light syllable or a short vowel.

A path (or filepath, file path, pathname, or similar) is a string that uniquely identifies an item in a hierarchical file system. Generally, a path is composed of directory names, special format specifiers, and optionally a filename, all separated by delimiters. This delimiter can vary by operating system, but popular, modern systems use the slash /, backslash \, or colon :.

The case-sensitivity of individual path components will vary based on operating system, or based on options specified at the time of a file system's creation or first use. In practice, this means that for a case-sensitive system, path components named component1 and Component1 can coexist at the same level in the hierarchy, whereas for a case-insensitive file system, they cannot (an error will occur). macOS and Windows' native file systems are case-insensitive by default, whereas typical Linux file systems are case-sensitive.