It's the "ht" in http & html
... hideturtle() | ht() .... Move turtle to 
the origin  coordinates (0,0)  and set its heading to its start-orientation (which... [DOC] [TLE] HTML Standard [PAR] HTML, its supporting DOM APIs, as well as many of its supporting technologies, 
...... What some specifications, in particular the HTTP specification, refer to as a 
...... it is, one for the letters "HT" expanding them to "Hypertext", one for the letter "
M"... [DOC] [TLE] HTML ASCII Reference - W3Schools [PAR] HT, 09, horizontal tab.