In computer programming, a sigil is a symbol attached to a variable name, showing the variable's datatype. The term was first applied to Perl usage by Philip Gwyn in 1999 to replace the more cumbersome "funny character in front of a variable name". HTML and JavaScript in an IDE that uses color coding to highlight various keywords and help the developer see the function of each piece of code. ... In computer science and mathematics, a variable (sometimes called a pronumeral) is a symbol denoting a quantity or symbolic representation. ... In computer science, a datatype or data type (often simply a type) is a name or label for a set of values and some operations which one can perform on that set of values. ... Perl, also Practical Extraction and Report Language (a backronym, see below) is a dynamic procedural programming language designed by Larry Wall and first released in 1987. ...

The use of sigils was popularized by the BASIC programming language. The best known example of a sigil in BASIC is the dollar sign (“$”) appended to the names of all strings. Other sigils existed for integers and floating point numbers, and sometimes for other types as well. BASIC (Beginners All-purpose Symbolic Instruction Code) is a family of high-level programming languages. ... It has been suggested that the section The dollar symbol from the article United States dollar be merged into this article or section. ... In computer programming and some branches of mathematics, strings are sequences of various simple objects. ... The integers consist of the positive natural numbers (1, 2, 3, …), their negatives (−1, −2, −3, ...) and the number zero. ... A floating-point number is a digital representation for a number in a certain subset of the rational numbers, and is often used to approximate an arbitrary real number on a computer. ...

Larry Wall adopted shell scripting’s use of sigils for his popular scripting language Perl. However, as Perl is a weakly typed language, the sigils specify not fine-grained data types like strings and integers, but general categories such as scalars (using a prepended “$”), lists (using a “@”), hashes (using a “%”), and subroutines (using a “&”). Perl 6 introduces secondary sigils, or twigils, which are used to indicate the scope of variables. Prominent examples of twigils in Perl 6 include “^”, used with self-declared formal parameters (“placeholder variables”), and “.”, used with object attribute accessors (i.e., instance variables). Larry Wall (b. ... Scripting languages (commonly called scripting programming languages or script languages) are computer programming languages initially used only for simple, repeated actions. ... Perl, also Practical Extraction and Report Language (a backronym, see below) is a dynamic procedural programming language designed by Larry Wall and first released in 1987. ... In computing, weak typing, when applied to a programming language, is used to describe how the language handles datatypes. ... The term scalar is used in mathematics, physics, and computing basically for quantities that are characterized by a single numeric value and/or do not involve the concept of direction. ... Look up list in Wiktionary, the free dictionary This article is about the word list as used in computer science. ... In computer science, a hash table is a data structure that speeds up searching for information by a particular aspect of that information, called a key. ... In computer science, a subroutine (function, procedure, or subprogram) is a sequence of code which performs a specific task, as part of a larger program, and is grouped as one or more statement blocks; such code is sometimes collected into software libraries. ... Perl 6 is the next version of the Perl programming language, currently under development. ...

In the PHP language, which was derived partly from Perl, “$” precedes any variable name. Names not prepended by this are considered constants. PHP is a scripted programming language that can be used to create websites. ... In computer science and mathematics, a variable (sometimes called a pronumeral) is a symbol denoting a quantity or symbolic representation. ... In mathematics and the mathematical sciences, a constant is a fixed, but possibly unspecified, value. ...

In Ruby, ordinary variables lack sigils, but “$” is prepended to global variables, “@” is prepended to instance variables, and “@@” is prepended to class variables (the second “@” cannot be considered a twigil, so “@@” is just a longer sigil). Ruby is a reflective, object-oriented programming language. ... In computer programming, a global variable is a variable that does not belong to any subroutine in particular and can therefore can be accessed from any context in a program. ... In object-oriented programming, an instance variable or data member is the data encapsulated within a class or object. ... In computer science and mathematics, a variable is a symbol denoting a quantity or symbolic representation. ...

Related to sigils is Hungarian notation, a convention for variable naming that specifies variable type by attaching certain alphabetic prefixes to the variable name. Unlike sigils, however, Hungarian notation provides no information to the compiler; as such, explicit types must be redundantly given for the variables and the prefixes are not enforced, making them more prone to omission and misuse. Hungarian notation is a naming convention in computer programming, in which the name of an object indicates its type or intended use. ...