Ten foot rule

The Ten Foot Rule is rule in SCA heraldry, requiring that any arms clearly display points of difference from a minimum distance of ten feet. This is judged by holding up a standard-sized shield painted with the arms and comparing it from a distance of twelve feet (or, more commonly, a half-sized printout from the distance of five feet) from the next comparable device. If the differences aren't instantly clear, the arms will not be passed into the SCA armorial.

Similar to the ten-foot rule is a rule of thumb for demos, which is that, from the distance of ten feet, all equipment must appear medieval.