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# definition of the word Appendix:Unsupported_titles

by the Wiktionnary

The symbol # derives from the abbreviation lb for Latin libra (pound), via the medieval convention of indicating abbreviations with an over-stroke, which in this case crossed the risers of the l and b (approximately l͞b, or lb).

 Singular # Plural # or #s

# (plural # or #s)

1. (food packaging, US) Pound (unit of weight)
3# — "three pounds"
2. (followed by a numeral: used attributively) Number
#3 — "number three"

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Full stop

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.

1. full stop or period (used to indicate the end of a sentence).
2. end of abbreviation
etc. — “et cetera”
3. In some counting systems, the decimal separator.
4. In some counting systems, the thousands separator.
5. (computing) a delimiter
en.wiktionary.org — “the Internet domain name with components ‘en’, ‘wiktionary’, and ‘org’”
document.txt — “the file with the base name ‘document’ and the extension ‘txt’”
6. (computing, various operating systems) the current directory
ls . — “list the contents of the current directory”
7. (computing, various programming languages) structure access operator
point.x — “the ‘x’ property of the ‘point’ variable”

In English, the symbol . has various names, used in different contexts:

• To signify the end of a sentence: period or full stop
• My name is John. - My name is John period (US) or My name is John full stop (UK)
• For use as a decimal separator: point
• 3.45 - three point four five
• For use of a thousand separator: - (not pronounced)
• There are 1.000 species left. - There are one thousand species left
• In names in computing contexts (file-names, domain-names, and so on): dot
• john.smith@example.com - john dot smith at example dot com
• (decimal separator): , (in some counting systems)
• (thousand separator): , (in some counting systems)

.

1. (computing) the parent directory.

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Colon (punctuation)

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:

1. colon (used to separate numbers in a ratio).
There is a 5:4 ratio of boys to girls in my class.

::

1. (rare) (Used in a proportion to separate one ratio from another.)

:(

1. Alternative form of :-(.

:)

1. Alternative form of :-).

First used with the intended purpose of expressing emotion in a post by Scott Fahlman to the Carnegie Mellon University computer science general bulletin board on 19 September 1982[1].

:-(

1. (Internet, instant messaging) sad face.
2. (Can we verify(+) this sense?) (Internet, instant messaging) frowning face.

First used with the intended purpose of expressing emotion in a post by Scott Fahlman to the Carnegie Mellon University computer science general bulletin board on 19 September 1982[1].

:-)

1. a smiley face

:=

1. Indicates that the thing on the left is defined to be the thing on the right

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Less than

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<

1. Less than; used to show the number on the left has a lower value than the one on the right.
$\forall x< 3$for all x less than three
x < 3 — x is less than three

From its shape as a heart.

<3

1. (emoticon) Love.

<>

• Used especially in plaintext, wherein the more usual symbol cannot be used.
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Cover

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1. covers. "is covered by"

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Greater than

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>

1. Greater than, more than; used to show the number on the left has a greater value than the one on the right.
$\forall x>3$
for all x greater than three
x > 3
x is greater than three

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Bracket

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[

1. left square bracket
2. (mathematics) In set builder notation, an inward facing bracket represents a closed endpoint of an interval (an inward facing parenthesis denotes an open endpoint).
$[a,b)=\{x\in\R\,|\,a\le x,
3. (mathematics) In ISO 31-11 notation, an inward facing bracket denotes a closed endpoint of an interval and an outward facing bracket denotes an open endpoint.
$\left[a,b\right[ = \{x\,|\, a\le x < b\}$

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Bracket

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]

1. right square bracket

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Underscore

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_

1. The underscore symbol, often used in place of a space in email addresses.

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Bracket

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{

1. left curly bracket

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Sheffer stroke

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|

1. (logic) vertical bar, or pipe (used to join two statements of which not both are true.)
2. (mathematics) Such that; having the property that.
$\lbrace x\in\mathbb{R}|x>0\rbrace$
3. (mathematics, of an expression) Evaluated at.
x + 2 | x = 1 = 3
4. (mathematics) absolute value, or, more generally, modulus
|-3| = 3
For x = (1,1), and y = (4,5), |x – y| = √([1–4]2 + [1–5]2) = 5
5. determinant
|A| means the determinant of the matrix A
6. (mathematics) cardinality
$\left|\{3, 5, 7, 9\}\right| = 4$
7. (mathematics) number of connected components
$\left|S^0\right|=2$
8. (statistics) conditional probability
Pr(X|Y) — "The probability of X given Y"

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Bracket

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}

1. right curly bracket
• Notes:
1. 1.0 1.1 ":) turns 25", 2007-09-20. Retrieved on 2007-09-20.