Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.
Ideally, a photograph should include a ruler with the subject (example) or an added scale marking.
SI ("metric") units are the most commonly used worldwide (see meter and centimeter).
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2009-03-28 15:23 Vancircuit 600×450× (167805 bytes) slightly larger version- I am the copyright holder and release the image as public domain. ~~~~
{{Information |Description={{en|Vancircuit (talk) 15:24, 28 March 2009 (UTC)}} |Source=Transferred from [http://wiki.riteme.site en.wikipedia]; transfer was stated to be made by User:Abisys. |Date={
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