What are some symbols that cannot be used in approved American Angus tattoo?

In approved American Angus tattoos, symbols that cannot be used include any characters or designs that are not alphanumeric, such as special characters (e.g., @, #, $, %, &). Additionally, tattoos must avoid symbols that could be considered offensive or inappropriate. The focus is on clear identification, primarily using letters and numbers to ensure easy readability and compliance with breed registration standards.