Convention (norm)

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Set of agreed, stipulated, or generally accepted standards
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In the 19th century and early 20th century, photographs did not often depict smiling people in accordance to cultural conventions of Victorian and Edwardian culture. In contrast, the photograph Eating Rice, China reflects differing cultural attitudes of the time, depicting a smiling Chinese man.[1]

A convention is a set of agreed, stipulated, or generally accepted standards, norms, social norms, or criteria, often taking the form of a custom.

In a social context, a convention may retain the character of an "unwritten law" of custom (for example, the manner in which people greet each other, such as by shaking each other's hands). Certain types of rules or customs may become law and regulatory legislation may be introduced to formalize or enforce the convention (for example, laws that define on which side of the road vehicles must be driven).

In physical sciences, numerical values (such as constants, quantities, or scales of measurement) are called conventional if they do not represent a measured property of nature, but originate in a convention, for example an average of many measurements, agreed between the scientists working with these values.