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).
Types of USB connectors (from left to right: male Mini USB (8-pin) B-Type, mini USB, B-type, A-type mother, A-type), with a one-ruble coin (20.5 mm diameter) in front for comparison
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
Captions
Pievieno vienas rindiņas aprakstu, ko šis fails attēlo
{{Information |Description=Types of USB connectors (from left to right: micro USB, mini USB, B-type, A-type mother, A-type |Source=self-made |Date=~~~~~ |Author= User:George Shuklin }} {{PD-self}}
Šis fails satur papildu informāciju, kuru, visticamāk, ir pievienojis digitālais fotoaparāts vai skeneris, ar ko veidots fails. Ja šis fails pēc tam ir ticis modificēts, šie dati var neatbilst izmaiņām (var būt novecojuši).