The term 'fax' is an abbreviation for the word 'FACSIMILE, ' which is a system of sending documents electronically over telephone lines. The two crossword solutions for this term are 'SEND' and 'DATA.' 'SEND' refers to the act of transmitting the document, while 'DATA' refers to the information that is being sent. Together, these two words describe the process of faxing, which is the electronic transmission of documents over telephone lines.