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This template is identical to Template:Flag, except that the flag links to its image description page, for pages where the flag is for information rather than just decoration, or for non-public domain images for which attribution is required.
The c in the name refers to "clickable".
Example
{{flagc|USA}}
→USA
Compare:
{{flag|USA}}
→USA - image is not clickable
{{flag icon|USA}}
→- image links to the country concerned