Identifiers are names you give to database or replication objects. They include object names, column names, variable names, and parameter names.
Identifiers can be 1–30 bytes long (equivalent to 1–30 single-byte characters). The first character must be a letter or the @ or _ character.
Replication Server function parameters are the only identifiers that can begin with the @ character. Function parameter names can include up to 30 characters after the @ character.
After the first character, identifiers can include letters, digits, and the #, $, or _ character. You cannot embed spaces in identifiers.
