the 26 upper-case letters | A B C ... X Y Z |
the 10 digits | 0 1 2 3 4 5 6 7 8 9 |
and 13 special characters: |
+ | plus | - | minus |
* | asterisk | / | slash |
|
blank | = | equals |
( | left parenthesis | ) | right parenthesis |
. | decimal point | , | comma |
' | apostrophe | : | colon |
$ | currency symbol |
<
and >
. Some of the special
characters, such as the asterisk and parentheses, are also rather
overloaded with duties.