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).
လိက်တအ်ဂှ် သၠးကဵုလဝ် အခေါင် သွက်ဂွံ စၠောအ်ကပ်ပဳ၊ ပရး ကီု သီုကဵု ပလေဝ်ပခိုဟ်ပတိုန် အတိုင်သၞောတ်ဝ် GNU Free Documentation License, တုဲ မူ ၁.၂ ဟွံသေင်မ္ဂး မူတြေံနူဂှ် မတြးပတိတ် နကဵု သၞောတ်ဝ်လာင်ဇြေန် Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue
{{Information |Description=[http://en.wikipedia.org/wiki/Carcharodontosaurus Carcharodontosaurus] tooth, which was found in Sahara Desert and [http://en.wikipedia.org/wiki/Megalodon Megalodon tooth] |Source=self-made |Date=2007 |Author= [http://home.comca