- Tab (0x09)
- Carriage return (0x0D)
- Newline (0x0A)
- ASCII characters with codes above 127 (unless multi-byte characters are enabled and charSet is populated appropriately)
- HTML tags (e.g. or ™)
Many variables, most notably products, hierarchy, and events, have additional limitations or syntax requirements. For individual variable limitations and syntax requirements, see the section corresponding to the s_account variable parameters.