control

v. rule, command; restrain; supervise; examine, check

n. rule, command; supervision; control panel; restraint

Control is used in a variety of contexts to express "mastery" or "proficiency": e.g. "Music students attending a master class are expected to have full control of basic skills such as rhythm and pitch".
See more at Wikipedia.org...

In computing, control-\ is a control character in ASCII code, also known as the field separator (FS) character. It is generated by pressing the key while holding down the key on a computer keyboard.Under most UNIX based operating systems control-\ is used to terminate a running process from a command shell and have it produce a memory core dump by sending it a SIGQUIT signal.
See more at Wikipedia.org...

Get Smart is an American comedy television series that satirized the secret agent genre. Originally sponsored by Lever Brothers (makers of Lifebuoy Soap) and R. J. Reynolds (makers of Salem Cigarettes), it aired on the NBC television network from September 18, 1965 to April 12, 1969, after which it moved to CBS for its final season, running from September 26, 1969 to September 11, 1970. A total of 138 episodes were broadcast. The show was quite popular in the mid-1960s, and continues to enjoy a cult following to this day.
See more at Wikipedia.org...

The null character (also null terminator) is a character with the value zero, present in the ASCII and Unicode character sets, and available in nearly all mainstream programming languages. The original meaning of this character was like NOP — when sent to a  printer or a terminal, it does nothing (some terminals, however, incorrectly display it as space). On punched tapes, this character is represented with no holes at all, so a new unpunched tape is initially filled with null characters.
See more at Wikipedia.org...

Noun
1. power to direct or determine; "under control"
(hypernym) power, powerfulness
(hyponym) authority, authorization, authorisation, dominance, say-so
(derivation) command
2. a relation of constraint of one entity (thing or person or group) by another; "measures for the control of disease"; "they instituted controls over drinking on campus"
(hypernym) relation
3. (physiology) regulation or maintenance of a function or action or reflex etc; "the timing and control of his movements were unimpaired"; "he had lost control of his sphincters"
(hypernym) bodily process, body process, bodily function, activity
(hyponym) motor control
(derivation) operate
(classification) physiology
4. a standard against which other conditions can be compared in a scientific experiment; "the control condition was inappropriate for the conclusions he wished to draw"
(synonym) control condition
(hypernym) criterion, standard
(part-holonym) experiment, experimentation
5. the activity of managing or exerting control over something; "the control of the mob by the police was admirable"
(hypernym) activity
(hyponym) repression
(derivation) manipulate, keep in line
6. the state that exists when one person or group has power over another; "her apparent dominance of her husband was really her attempt to make him pay attention to her"
(synonym) dominance, ascendance, ascendence, ascendancy, ascendency
(hypernym) condition, status
(hyponym) ascendant, ascendent
7. discipline in personal and social activities; "he was a model of polite restraint"; "she never lost control of herself"
(synonym) restraint
(hypernym) discipline
(hyponym) self-restraint, temperateness
8. great skillfulness and knowledge of some subject or activity; "a good command of French"
(synonym) command, mastery
(hypernym) skillfulness
(derivation) hold in, hold, contain, check, curb, moderate
9. the economic policy of controlling or limiting or curbing prices or wages etc.; "they wanted to repeal all the legislation that imposed economic controls"
(hypernym) economic policy
(hyponym) price control
10. a mechanism that controls the operation of a machine; "the speed control on his turntable was not working properly"; "I turned the controls over to her"
(synonym) controller
(hypernym) mechanism
(hyponym) cruise control
(derivation) operate
11. a spiritual agency that is assumed to assist the medium during a seance
(hypernym) spirit, disembodied spirit
Verb
1. exercise authoritative control or power over; "control the budget"; "Command the military forces"
(synonym) command
(hyponym) preoccupy
(derivation) restrainer, controller
2. lessen the intensity of; temper; hold in restraint; hold or keep within limits; "moderate your alcohol intake"; "hold your tongue"; "hold your temper"; "control your anger"
(synonym) hold in, hold, contain, check, curb, moderate
(hypernym) restrain, suppress, keep, keep back, hold back
(hyponym) restrict, restrain, trammel, limit, bound, confine, throttle
(derivation) command, mastery
3. handle and cause to function; "do not operate machinery after imbibing alcohol"; "control the lever"
(synonym) operate
(hypernym) manipulate
(hyponym) synchronize, synchronise
(verb-group) master
(derivation) controller
4. control (others or oneself) or influence skillfully, usually to one's advantage; "She manipulates her boss"; "She is a very controlling mother and doesn't let her children grow up"; "The teacher knew how to keep the class in line"; "she keeps in line"
(synonym) manipulate, keep in line
(hypernym) interact
(hyponym) tease
(derivation) restrainer, controller
5. verify or regulate by conducting a parallel experiment or comparing with another standard, of scientific experiments; "Are you controlling for the temperature?"
(synonym) verify
(hypernym) test, prove, try, try out, examine, essay
(verb-group) see, check, insure, see to it, ensure, ascertain, assure
6. verify by using a duplicate register for comparison; "control an account"
(hypernym) see, check, insure, see to it, ensure, ascertain, assure
(derivation) accountant, comptroller, controller
7. be careful or certain to do something; make certain of something; "He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product"
(synonym) see, check, insure, see to it, ensure, ascertain, assure
(hypernym) verify
(hyponym) proofread, proof
(verb-group) determine, check, find out, see, ascertain, watch, learn
8. have a firm understanding or knowledge of; be on top of; "Do you control these data?"
(synonym) master
(hypernym) know
(hyponym) cinch
(entail) understand
(verb-group) operate
(derivation) command, mastery

n. Control Break, key combination used to stop the execution of a program in DOS (Computers)

n. control; restraint; checkpoint, roadblock; censorship, censor