Distance symbols are markings found on the focus controls of simple cameras, serving as a visual guide to help photographers estimate the correct focus for subjects at different distances. These symbols often represent common ranges such as "portrait," "group," or numerical distances in meters or feet.
Using distance symbols allows photographers to achieve reasonably sharp images without precise measurement or complex focusing mechanisms, making them particularly useful in point-and-shoot cameras, early film cameras, and situations where quick shooting is required. They simplify the focusing process while helping ensure subjects are captured clearly.