符号域（英语：semiosphere）又译符号场或符号圈，是俄国符号学家尤里·洛特曼发展文化符号学中的关键术语，指符号存在和运作的空间和机制；它既是文化存在的条件，也是文化发展的结果[1]。符号域的概念奠基了洛特曼文化符号学理论的核心和基础[2]。
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