There is a silver mark on the back of the Ultraman card HR, indicating that it is a rare card. The silver mark seems to be an anti-counterfeiting mark that usually only appears on some rare cards to improve the card's anti-counterfeiting capabilities. Of course, specifically, the silver label may have more special meanings and attributes, such as representing the rarity of the card, special abilities, etc., which requires more information and materials to supplement and improve. In addition, this answer cannot answer the true meaning of Ultraman cards. It is recommended to consult the card game company to obtain more accurate information.