Sculpture Made Out Of Typewriter Parts

tty, short for teletypewriter, is used in Unix-like operating systems to designate a given "terminal".
Typewriter conventions
A number typographical conventions originate from the widespread use the typewriter, based on the characteristics and limitations the typewriter itself. For example, the QWERTY keyboard typewriter did not include keys for the en dash and the em dash. To overcome this obstacle, users typically typed more than one adjacent hyphen to approximate these symbols. This typewriter convention is still sometimes used today, even though modern computer word processing applications can input the correct en and em dashes for each font type. Other examples typewriter practices that are sometimes still used in desktop publishing systems include inserting a double space at the end a sentence, and the use prime marks (or "dumb quotes") as quotation marks. The practice underlining text in place italics and the use all capitals to provide emphasis are additional examples typographical conventions that derived from the limitations the typewriter keyboard that still carry on today.