## Names

The following rules apply to user-assigned symbols, i.e. the names of variables, functions, operators, classes and labels in APLX.

The first character of the name must be one of the alphabetic characters A-Z or a-z, or one of the characters ‘ or þ. Subsequent characters can also include digits 0-9, underbar _ and high minus ¯.

Names consist of up to 30 characters (longer names will be truncated).

The following are all valid names in APLX:

    DATA X X1 FIRST_VALUE ‘ ‘L1 ErrorCode model mode¯restart a999 Item‘1

Case is significant in names, so `DATA` `Data` and `data` are three distinct names.

There are no reserved names in APL. System-assigned names are distinct from user-assigned names because they start with a Quad Œ symbol.

Topic: APLX Help : Help on APL language : APL Fundamentals : Names

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