Character

Meaning

Usage

SPACE

Blank

Throughout ESL

A-Z

Uppercase

Throughout ESL

a-z

Lowercase

Throughout ESL

0-9

Digits

Throughout ESL

=

Equal sign

Relational operator

!=

Not equal sign

Relational operator

+

Plus sign

Arithmetic operator

-

Minus sign

Arithmetic operator

*

Multiplication sign

Arithmetic operator

/

Division sign

Arithmetic operator

\

Backslash

Escape character

(

Left parenthesis

Required in expressions

)

Right parenthesis

Required in expressions

[

Left bracket

Required in arrays

]

Right bracket

Required in arrays

#

Number sign

Comment character

,

Comma

Separator in drawing statements

.

Decimal point

Floating point values

<

Less than

Relational operator

<=

Less than or equal to

Relational operator

>

Greater than

Relational operator

>=

Greater than or equal to

Relational operator

“

Quotation mark

String delimiter

_

Underscore

Allowed in identifiers

:

Colon

Separator in argument lists and pattern scaling

All characters

String values