Unofficial flags

Unofficial flags are either (a) flags in regular use that have no official status or (b) flag concepts that have appeared in various publications.

Examples of the former type are: Boxing kangaroo, Fighting Kiwi, Chatham Islands, Rotuma, West Irian, Jolly Roger. These are examples of flags used at sporting fixtures, reproductions of no-longer-used historical flags, or used by a regional populace out of spontaneity, though not officially approved (or gazetted).

Examples of the latter type are: North Island, South Island, Stewart Island/Rakiura, 51-Star United States Flag, Antarctica. These are examples of flag ideas put forward by vexillologists/flag designers that have been picked up by various publications (books, magazine articles, online reference sites, etc.).

Examples

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  Chatham Islands flag (used widely, but status unofficial)
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  Unofficial local flag of Saint Pierre and Miquelon
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  Flag of Wake Island used in military ceremonies similar to the Czech flag
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  Korean Unification Flag, used in sports contexts
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  South Island (NZ) conceptual flag
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  People's Flag of Milwaukee
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  51-star conceptual United States flag
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  Flag of Johnston Atoll (currently an uninhabited U.S. unincorporated territory)
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  True South flag concept for Antarctica
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  Graham Bartram flag concept for Antarctica
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  Whitney Smith flag concept for Antarctica
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  Flag of Earth proposed by Oskar Pernefel
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  Red Flag used for socialist movements
• 
  Unofficial flag of Northern Ireland, commonly used in sports