irregular card refers to a credit card with irregular shape, and the standard card is an international standard card with a size of 85.5mm×54mm×.76mm .. Nowadays, many kinds of "weird" cards have appeared all over the world, which we call special-shaped cards. These cards, such as square, rectangle, triangle and ellipse, are called "non-standard cards". Some special animal-shaped and doll-shaped cards are called "quasi-shaped cards".

special-shaped cards are usually non-international standard cards tailored to individual needs, and their thickness and size are different from those of standard cards. It is reported that the basic thickness of special-shaped credit cards is .3mm, .5mm, .6mm and .76mm, and the card size is also different from that of conventional cards. Personalized patterns or commemorative pictures can be used on the card cover.

however, due to the abnormal size of the special-shaped card, there are some restrictions on its use. Therefore, in order to ensure that cardholders can enjoy all the services of credit cards, banks should apply for a standard card at the same time when they apply for special-shaped cards, so as to ensure that special-shaped cards can still enjoy credit card services when they cannot be used.