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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...

naling or signal may mean: Scientific concepts A signal (information theory), is a flow of information;A signal (computing), an event (a message, a data structure) transmitted between computational processes;Signals and slots is software pattern implementation closely related to the Observer pattern.Signaling (economics) is a subtle means of conveying information;Signaling (telecommunication) is a part of some communication protocols;Signals (biology) are electrochemical activity in an organism; See more at Wikipedia.org...