+**406** is a natural number, yet it often signifies a boundary or refusal in digital communication. As an [HTTP Status](/wiki/HTTP_Status), 406 denotes that the server cannot deliver content in a format acceptable to the [Client](/wiki/Client).
+## See also
+- [Number](/wiki/Number)
+- [Web Protocol](/wiki/Web_Protocol)
+- [Error Message](/wiki/Error_Message)
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