An apparatus (plural apparatus, apparatuses) may be one of the following:
1. A machine , as in a fire engine or fire truck.
2. Reference tools added to a book, apart from the text, such as variant readings or translations, textual notes, a concordance, a bibliography, or an index, designed for the use of scholars studying the book.
3. One or more pieces of equipment on or with which gymnastics is performed.
"Apparatus" is in the NAICS Code "334210"
(Telephone Apparatus ManufacturingToll switching equipment, telephone, manufacturing)