Jisho

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Noun, Noun which may take the genitive case particle 'no'
1. symbol; code; sign; notation
Wikipedia definition
2. Sign (semiotics)A sign is understood as a discrete unit of meaning in semiotics. It is defined as "something that stands for something, to someone in some capacity" It includes words, images, gestures, scents, tastes, textures, sounds – essentially all of the ways in which information can be communicated as a message by any sentient, reasoning mind to another. The nature of signs has long been discussed in philosophy.
Read “Sign (semiotics)” on English Wikipedia
Read “記号” on Japanese Wikipedia
Read “Sign (semiotics)” on DBpedia

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