Reference > Keyboard shortcuts >
Selection

To: | Keyboard Shortcut: (Windows) | Keyboard Shortcut: (Mac OS X) | Action/Results:
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Select All | Ctrl + A | Command + A | Selects all models in the 3D View.
Invert Selection | Ctrl + Shift + I | Command + Shift + I | Selects any un-selected faces and deselects any existing selected faces in the 3D View.
Deselect All | Ctrl + D | Command + D | Clears the current selection.
Grow Selection | Ctrl + ] | Command + ] | Selects faces adjacent to the currently selected faces. Requires at least one face to be pre-selected.
Select Level | Shift + A | Shift + A | Selects all visible faces belonging to the subdivision level of the active face (the face under the cursor when the hotkey is pressed).
Select Face | Shift + S | Shift + S | Selects the active face (the face under the center of the cursor when the hotkey is pressed).
Drag Rectangle | Middle button + Left button | Middle button + Left button | Choose a selection tool from the Select/Move Tools tray then press the left and middle button simultaneously while dragging around the item. To make this mode the default for a selection tool, choose Rectangle under the Selection Mode tool property.