The VT designation was one of the original designations. Animals with more specific designations are also listed. Both terms originated as military designations. The designations and naming vary by state. There were formal legal designations of racial categories. An enzyme is fully specified by four numerical designations. Species with these designations receive protections under federal law. There are 193 continuing education certificates/designations available. The designations of the bars varied regionally. Research has shown the use of these subspecies designations is questionable. Some researchers question whether such species designations have practical meaning. However, these designations differed between various countries. Army groups received Arabic numeral designations and national designations when combined. Buildings in these districts with individual landmark designations are described in . AASHTO defines a category of special routes separate from primary and auxiliary Interstate designations.