cursor

the underline or block which moves around the screen when characters are typed.

Cursors have various forms depending on the terminal: highlighted, blinking, reverse video, etc. In all cases, the cursor indicates where the next character typed is displayed on the screen. Cursor movement commands are used to position the cursor anywhere in the item without altering the text. The cursor actually moves on the screen of the CRT, but since the screen is only a window into the item, the cursor may be moved off the screen, forcing a screen redisplay or 'scrolling' to the next screen.