The visual component of a scrollbar that moves to indicate your current position within the data. -[FW]

[PT] 12-Aug-2003: 
This is more usually termed the ''scrollbar thumb''.

[FW]: Hm.  While thumb is more common (I just did a Google search comparing them - news to me), I think elevator is [Microsoft]'s term for it (not that they're the authority, but the majority of Tcl coders do use Windows).

[RS] didn't know either term - for vertical scrollbars, "elevator" tells it quite nicely, but a horizontal one?