A combination lock is a type of padlock in which a sequence (permutation) of numbers or symbols is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed numerals which directly interact with the locking mechanism, or through an electronic or mechanical keypad. Types range from inexpensive three-digit luggage locks to high-security safes. Unlike a regular padlock, combination locks don't use keys
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Famous quotes containing the words combination and/or lock:
“Only amateurs say that they write for their own amusement. Writing is not an amusing occupation. It is a combination of ditch-digging, mountain-climbing, treadmill and childbirth. Writing may be interesting, absorbing, exhilirating, racking, relieving. But amusing? Never!”
—Edna Ferber (1887–1968)
“Benjamin: Are you always this much afraid of being alone?
Mrs. Robinson: Yes.
Benjamin: Well, why can’t you just lock the doors and go to bed?
Mrs. Robinson: I’m very neurotic.”
—Calder Willingham (1923–1995)