Prime (symbol) facts for kids

Kids Encyclopedia Facts
Prime
Double prime Triple prime
Punctuation
apostrophe   '
brackets [ ]  ( )  { }  ⟨ ⟩
colon :
comma ,  ،  
dash ‒  –  —  ―
ellipsis   ...  . . .      
exclamation mark  !
full stop, period .
guillemets ‹ ›  « »
hyphen
hyphen-minus -
question mark  ?
quotation marks ‘ ’  “ ”  ' '  " "
semicolon ;
slash, stroke, solidus /    
Word dividers
interpunct ·
space     
General typography
ampersand &
asterisk *
at sign @
backslash \
basis point
bullet
caret ^
dagger † ‡ ⹋
degree °
ditto mark ” 〃
equals sign =
inverted exclamation mark ¡
inverted question mark ¿
komejirushi, kome, reference mark
multiplication sign ×
number sign, pound, hash #
numero sign
obelus ÷
ordinal indicator º ª
percent, per mil  % ‰
pilcrow
plus, minus + −
plus-minus, minus-plus ± ∓
prime     
section sign §
tilde ~
underscore, understrike _
vertical bar, pipe, broken bar |    ¦
Intellectual property
copyright ©
copyleft 🄯
sound-recording copyright
registered trademark ®
service mark
trademark
Currency
currency sign ¤

؋ ​₳ ​ ฿ ​ ​ ₵ ​¢ ​₢ ​ $ ​₫ ​₯ ​֏ ​ ₠ ​ ​ ƒ ​₣ ​ ₲ ​ ₴ ​ ₭ ​ ₺ ​₾ ​ ​ ₦ ​ ₧ ​₱ ​₰ ​£ ​ 元 圆 圓 ​៛ ​₽ ​₹ ₨ ​ ₪ ​ ​₸ ​₮ ​ ₩ ​ ¥ ​

Uncommon typography
asterism
fleuron, hedera
index, fist
interrobang
irony punctuation
lozenge
tie
Related
In other scripts
  • Chinese
  • Hebrew
  • Japanese
  • Korean
  • Category
  • Book
This article contains special characters. Without the correct software, you may see question marks, boxes, or other symbols.

The prime symbol (), double prime symbol (), triple prime symbol (), quadruple prime symbol () etc., are used to designate units and for other purposes in mathematics, the sciences, linguistics and music.

Although similar in appearance, the prime symbol should not be confused with the apostrophe (’ or '), single quotation mark (' or or ), acute accent (´), or grave accent (`); the double prime symbol should not be confused with the double quotation mark (“…” or "…"), the ditto mark (), or the letter double apostrophe (ˮ). The prime symbol is very similar to the Hebrew geresh, but in modern fonts the geresh is designed to be aligned with the Hebrew letters and the prime symbol is not, so they should not be interchanged. All of these similar-appearing symbols have different meanings, and their character-codes are treated differently by typesetting and font rendering software.

Designation of units

The prime symbol () is commonly used to represent feet (ft) and arcminutes (arcmin). However, for convenience, a (') (single quote mark) is commonly used.

The double prime () represents inches (in) and arcseconds (arcsec). However, for convenience, a (") (double quotation mark) is commonly used.

Thus, 3′ 5″ could mean 3 feet and 5 inches (of length), or 3 minutes and 5 seconds (of arc). As an angular measurement, 3° 5′ 30″ means 3 degrees, 5 arcminutes and 30 arcseconds.

The triple prime () in watchmaking represents a ligne or 1/12 of an inch. It is also occasionally found in historical astronomical works to denote thirds (160 of a second of arc).

Likewise, a quadruple prime () denotes fourths (160 of a third, a convention already used by Jamshīd al-Kāshī).

See also: Positional notation#Sexagesimal system

Prime (symbol) Facts for Kids. Kiddle Encyclopedia.