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>For other uses of the word button, see Button (disambiguation). A button is small disc- or knob-shaped object attached to cloth or an article of clothing. Buttons may be manufactured from an extremely broad variety of materials, including bone, ivory, metal, plastic, and wood. Buttons were first used by the Ancient Romans.The functional role of buttons is to fasten or cinch the openings of a garment. By sliding the button through a slit (the ) in the to which the first is to be held. The slit is only sufficiently wide to allow the button to be fully pushed through while still remaining stitched to the first piece of cloth. See more at Wikipedia.org...

in an otherwise solid, opaque surface through which light and sometimes air can pass. For example, a window in the wall of a house, or a window in a scientific measurement device that permits reading of certain wavelengths.Window is also used metaphorically to refer to a time period during which something can occur and outside of which the thing cannot occur, as in a window of opportunity to launch a rocket to the moon on the most efficient trajectory.The word Window dates back to Old Norse "Wind Eye"; opening to the air. See more at Wikipedia.org...