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==Description==
<tt><nowiki>{{fbu|age|nation|variant|size=optional|name=optional}}</nowiki></tt>

Produces a flag icon attached to a wikilinked national under-''NN'' (e.g. under-20, under-21, etc.) football team article.
;Parameters
*''nation'' — Use either the name of the nation or the three-letter country code as used in [[List of NSSport trigrammes|NS Sport]]
*''age'' — Specifies the age limit (e.g. "20", "21", etc.)
*''variant'' (optional) — Specifies an alternate (historical) flag to use.  This parameter is documented by the appropriate template in [[:Category:Country data templates]].
*''size'' (optional) — Can be used to change the flag icon size (use sparingly!)
*''name'' (optional) — Can be used to change the wikilink display text

==Examples==
*<tt><nowiki>{{fbu|21|Osarius}}</nowiki></tt> → {{fbu|21|Osarius}}
*<tt><nowiki>{{fbu|20|Aquillian}}</nowiki></tt> → {{fbu|20|Aquillian}}
*<tt><nowiki>{{fbu|21|ERS}}</nowiki></tt> → {{fbu|21|ERS}}
*<tt><nowiki>{{fbu|20|OSR}}</nowiki></tt> → {{fbu|20|OSR}}
*<tt><nowiki>{{fbu|21|Osarius|pre2185}}</nowiki></tt> → {{fbu|21|Osarius|pre2185}}

==See also==
*[[Template:Fb]] — for main national football teams

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