Tab
The TAB key can be used to skip logically to the next Tab stop (also physically, if Tabs are set on the terminal). If more Tabs are included in a line than there are Tab stops, a new work line is created. The default tab key is Control-I (TAB), but it can be changed (Set Tabs “_”). The default Tab stops are every 10 columns (MPE) or every 8 columns (HP-UX), but you can set the tabs to whatever columns you like with Set Tabs.