HP 3500 - Manual (Page 246)

supplies
Materials used by the printer that are used up and must be replaced. Supply
items for the printer are the four print cartridges, the transfer unit, and the
fuser.
TCP/IP
An internet protocol (developed by the U.S. Department of Defense) that
has become the global standard for communications.
toner
The fine black or colored powder that forms the image on the printed media.
transfer unit
The black plastic belt that transports the paper inside the printer and
transfers the toner from the print cartridges onto the paper.
tray
A receptacle for holding blank paper.
234 Glossary ENWW