beacon vs control

That which gives notice of danger, or keeps people on the correct path. 

An electronic device that broadcasts a signal to nearby portable devices, enabling smartphones etc. to perform actions when in physical proximity to the beacon. 

A signal fire to notify of the approach of an enemy, or to give any notice, commonly of warning. 

A high hill or other easily distinguishable object near the shore which can serve as guidance for seafarers. 

A signal or conspicuous mark erected on an eminence near the shore, or moored in shoal water, as a guide to mariners. 

A post or buoy placed over a shoal or bank to warn vessels of danger; also a signal mark on land. (FM 55-501) 

A security mechanism, policy, or procedure that can counter system attack, reduce risks, and resolve vulnerabilities; a safeguard or countermeasure. 

A duplicate book, register, or account, kept to correct or check another account or register. 

An interface element that a computer user interacts with, such as a window or a text box (abbreviated Ctrl). 

Influence or authority over something. 

A control group or control experiment. 

A checkpoint along an audax route. 

A means of monitoring for, and triggering intervention in, activities that are not going according to plan. 

The method and means of governing the performance of any apparatus, machine or system, such as a lever, handle or button. 

Restraint or ability to contain one's movements or emotions, or self-control. 

A spirit that takes possession of a psychic or medium and allows other spirits to communicate with the living. 

A construction in which the understood subject of a given predicate is determined by an expression in context. See control. 

Any of the physical factors determining the climate of a place, such as latitude, distribution of land and water, altitude, exposure, prevailing winds, permanent high- or low-barometric-pressure areas, ocean currents, mountain barriers, soil, and vegetation.