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The open systems theory is the foundation of black box theory. Both have focus on input and output flows, representing exchanges with the surroundings. In systems theory, the black box is an abstraction representing a class of concrete open system which can be viewed solely in terms of its stimuli inputs and output reactions:
The handkerchief code (also known as the hanky code, the bandana code, and flagging) [1] is a system of color-coded cloth handkerchief or bandanas for non-verbally communicating one's interests in sexual activities and fetishes.
Likewise, the ace of clubs is used to symbolize gray asexuality and grayromanticism, and the ace of diamonds is used to symbolize demiromanticism and demisexuality. [ 73 ] A pin depicting an arrow with the fletching representing the Aromantic Pride flag colors
Hospital emergency codes are coded messages often announced over a public address system of a hospital to alert staff to various classes of on-site emergencies. The use of codes is intended to convey essential information quickly and with minimal misunderstanding to staff while preventing stress and panic among visitors to the hospital.
Black tie is traditionally worn only after six o'clock in the evening, or after sundown during winter months. Black tie's rough daytime equivalent is the stroller, which is less formal than morning dress because, as with black tie, it replaces the tailcoat with a lounge coat. Contrary to the trend seen in evening dress, the less formal stroller ...
Black power is a political slogan and a name which is given to various associated ideologies which aim to achieve self-determination for black people. [1] [2] It is primarily, but not exclusively, used by black activists and other proponents of what the slogan entails in the United States. [3]
In others, a black belt student should not be called sensei until they are Sandan (third-degree black belt), or the titles kyosa or sabom in Korean martial arts as a second degree or higher, as this denotes a greater degree of experience and a sensei must have this and grasp of what is involved in teaching a martial art.
The coat of arms of Germany displays a black eagle with a red beak, a red tongue and red feet on a golden field, which is blazoned: Or, an eagle displayed sable beaked langued and membered gules. This is the Bundesadler (German for ' Federal Eagle '), formerly known as Reichsadler (German: [ˈʁaɪ̯çsˌʔaːdlɐ] ⓘ, German for ' Imperial ...