UDF names must follow the same restrictions as other identifiers in Sybase IQ.
Sybase IQ identifiers have a maximum length of 128 bytes. For simplicity of use, UDF names should start with an alphabetic character. Alphabetic characters as defined by Sybase IQ include the letters of the alphabet, plus underscore (_), at sign (@), number or pound sign (#) and dollar sign ($). UDF names should consist entirely of these alphabetic characters as well as digits (the numbers 0 through 9). UDF names should not conflict with SQL reserved words. There is a list of SQL reserved words in the Sybase IQ 15.1 Reference: Building Blocks, Tables, and Procedures > SQL Language Elements > section Reserved words
Although UDF names (as other identifiers) may also contain reserved words, spaces, characters other than those listed above, and may start with a non-alphabetic character, this is not recommended. If UDF names have any of these characteristics, you must enclose them in quotes or square brackets, which makes it more difficult to use them.
The UDFs reside in the same name space as other SQL functions and stored procedures. To avoid conflicts with existing stored procedures and functions, preface UDFs with a unique short (2-letter to 5-letter) acronym and underscore. Choose UDF names that do not conflict with other SQL functions or stored procedures already defined in the local environment.
These are some of the prefixes that are already in use: