Due to technical restrictions, some page names are not allowed on Wiktionary. Since Wiktionary uses the term being defined as the page name, there are thus some terms that cannot have their own entry. Some of these are collected here instead. (For more information on the technical restrictions, which are in the software that Wiktionary runs on, see the MediaWiki Handbook).

# #

*See also*

**♯**

## Etymology

WikipediaThe symbol # derives from the abbreviation lb for [[w:Template:lang:la language|Template:lang:la]] 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~~).

## English

### Symbol

**#** (*plural*: **#**, **#s**)
In English it is called the pound sign, number sign, hash sign, or octothorpe.

- (food Template loop detected: Template:context 1) Pound (unit of weight):
*3#*"three pounds" - (Template loop detected: Template:context 1) Number:
*#3*"number three" - (computing) The hash character

# .

## Translingual

Wikipedia### Symbol

**.**

- full stop or period (used to indicate the end of a sentence).
- In some counting systems, the decimal separator.
- In some counting systems, the thousands separator.

# :

# ::

# <

## Translingual

Wikipedia### Preposition

**<**

- Less than; used to show the number on the left has a lower value than the one on the right.
- <math>\forall x< 3</math>

### Verb

**<**

- Is less than.
- <math>x< 3</math>

### Synonyms

- (less than): ≱

### Antonyms

- (less than): ≥

### Related Terms

# <3

## Translingual

### Etymology

From its shape as a heart.

### Verb

**<3**

- (Template loop detected: Template:context 1) Love.

# <·

# >

## Translingual

Wikipedia### Preposition

**>**

- Greater than, more than; used to show the number on the left has a greater value than the one on the right.
- <math>\forall x>3</math>

### Verb

**>**

- Is greater than.
- <math>x>3</math>

### Synonyms

- (greater than): ≰

### Antonyms

- (greater than): ≤

### Related Terms

# [

# ]

# _

## Translingual

Wikipedia### Symbol

**_**

- The underscore symbol, often used in place of a space in email addresses.
*My email address is jon***_**smith@mail.com.

# {

# |

## Translingual

### Conjunction

**|**

- (Template loop detected: Template:context 1) vertical bar, or pipe (used to join two statements of which not both are true.)

### Preposition

**|**

- (mathematics) Such that; having the property that.
- <math>\lbrace x\in\mathbb{R}|x>0\rbrace</math>

- (mathematics, Template loop detected: Template:context 1) Evaluated at.
- <math>x+2|_{x=1}=3</math>

### Verb

**|**

- (mathematics) Divides (evenly).
*3|6*

- (mathematics) absolute value
- |-3| = 3

- (geometry) Euclidean distance
- For x = (1,1), and y = (4,5),
**|**x – y**|**= √([1–4]2 + [1–5]2) = 5

- For x = (1,1), and y = (4,5),
- Determinant
- |
**A**| means the determinant of the matrix**A**

- |
- (mathematics) Cardinality
- |{3, 5, 7, 9}| = 4

- (statistics) Conditional probability