Question

history of conventional sign

Answer 1

A sign is an object, quality, event, or entity whose presence or occurrence indicates the probable presence or occurrence of something else.[1] A natural sign bears a causal relation to its object—for instance, thunder is a sign of storm, or medical symptoms signify a disease. A conventional sign signifies by agreement, as a full stop signifies the end of a sentence; similarly the words and expressions of a language, as well as bodily gestures, can be regarded as signs, expressing particular [Meaning (linguistics)|meanings]. The physical objects most commonly referred to as signs (notices, road signs, etc., collectively known as signage) generally inform or instruct using written text, symbols, pictures or a combination of these.