F for freeze, freeze time or freeze motion. Shutter speed of the exposure triangle is manipulated to freeze motion. Shutter speed of 1/500 or faster is recommended. Faster the shutter speed, better the motion freeze. Ideally, frozen motion is more effective when the background is blurred. I took numerous photos but could not get blurred background. The setting for the above picture are shutter speed 1/1000 sec, aperture f-1.8 and ISO 1000.
Sifting flour or flour rain is another example freeze, an archived picture from few years ago.
Camera: Nikon 5100
Picture of the day in 2012: Free choice Picture of the day in 2011: Sparrow on the wall