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Dr.Timothy, the 3 dot sights use a double white dot rear sight and a single white dot front sight as pictured here Sir : https://www.reloaderaddict.com/best-3-dot-sights-review/

Timothy, 3 dot sights are your most common style sights. You will have one dot on the front sight and two dots on your rear sight. When aiming you just have to line up the front dot in-between the two rear sight dots. You can just Google ( white dot sight images ) to view pictures. Hope this helps.