Global Minor Modes (Mastering Emacs

‘Column Number’ mode enables display of the current column number in the mode line. See Mode Line.
‘Delete Selection’ mode causes text insertion to first delete the text in the region, if the region is active. See Using Region.
‘Icomplete’ mode displays an indication of available completions when you are in the minibuffer and completion is active. See Icomplete.
‘Line Number’ mode enables display of the current line number in the mode line. It is enabled by default. See Mode Line.
‘Menu Bar’ mode gives each frame a menu bar. It is enabled by default. See Menu Bars.
‘Scroll Bar’ mode gives each window a scroll bar. It is enabled by default, but the scroll bar is only displayed on graphical terminals. See Scroll Bars.
‘Tool Bar’ mode gives each frame a tool bar. It is enabled by default, but the tool bar is only displayed on graphical terminals. See Tool Bars.
‘Tab Bar’ mode gives each frame a tab bar. See Tab Bars.
‘Tab Line’ mode gives each window a tab line. See Tab Line.
‘Transient Mark’ mode highlights the region, and makes many Emacs commands operate on the region when the mark is active. It is enabled by default. See Mark.