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The (freestanding) underscore character, _, also called a low line, or low dash, originally appeared on the typewriter so that underscores could be typed. To produce an underscored word, the word was typed, the typewriter carriage was moved back to the beginning of the word, and the word was overtyped with the underscore character.
The dash is a punctuation mark consisting of a long horizontal line. It is similar in appearance to the hyphen but is longer and sometimes higher from the baseline.The most common versions are the en dash –, generally longer than the hyphen but shorter than the minus sign; the em dash —, longer than either the en dash or the minus sign; and the horizontal bar —, whose length varies ...
Dash, Hyphen-minus-Hyphen-minus: Dash, Hyphen, Minus sign ☞ Index: Manicule, Obelus (medieval usage) · Interpunct: Full-stop, Period, Decimal separator, Dot operator ‽ Interrobang (combined 'Question mark' and 'Exclamation mark') Inverted question and exclamation marks ¡ Inverted exclamation mark: Exclamation mark, Interrobang ¿ Inverted ...
Depending on local conventions, underscores (underlines) may be used on manuscripts (and historically on typescripts) to indicate the special typefaces to be used: [4] [5] single dashed underline for stet, 'let it stand', proof-reading mark cancelled. single straight underline for italic type; single wavy underline for bold type
In Python, if a name is intended to be "private", it is prefixed by one or two underscores. Private variables are enforced in Python only by convention. Names can also be suffixed with an underscore to prevent conflict with Python keywords. Prefixing with double underscores changes behaviour in classes with regard to name mangling.
On most keyboards, it is the only character that resembles a minus sign or a dash, so it is also used for these. [1] The name hyphen-minus derives from the original ASCII standard, [2] where it was called hyphen (minus). [3] The character is referred to as a hyphen, a minus sign, or a dash according to the context where it is being used.
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name.
On most keyboards, it is the only character that resembles a minus sign or a dash so it is also used for these. [27] The name hyphen-minus derives from the original ASCII standard, [28] where it was called hyphen–(minus). [29] The character is referred to as a hyphen, a minus sign, or a dash according to the context where it is being used.