The character encoding defined by the ASCII standard is the following: code values are assigned to characters consecutively in the order in which the characters are listed as the table below: starting from 32 (assigned to space) and ending up with 126 (assigned to the tilde character ~). Positions 0 through 31 and 127 are reserved for control codes.

 

!

"

#

$

%

&

'

(

)

*

+

,

-

.

/

0

1

2

3

4

5

6

7

8

9

:

;

<

=

>

?

@

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

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P

Q

R

S

T

U

V

W

X

Y

Z

[

\

]

^

_

]]></ac:plain-text-body></ac:structured-macro>

'

a

b

c

d

e

f

g

h

i

j

k

l

m

n

o

p

q

r

s

t

u

v

w

x

y

z

{

|

}

~ 


There are several national variants of ASCII. Therefore, the original ASCII is often referred as *US-ASCII*. The international standar _ISO 646_ defines a character set similar to US-ASCII, but with code positions corresponding to US-ASCII characters @\[\]\{\|\}
as "national use positions". It also gives some liberties with characters #$^`~. In _ISO 646_, several "national variants of ASCII" have been defined, assigning different letters and symbols to the "national use" positions. Thus, the characters that appear in those positions - including those in *US-ASCII* are somewhat "unsafe" in international data transfer.
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