Japanese numismatic charms, also known as Japanese amulets, Japanese talismans, or simply Japanese charms, refer to a family of cash coin-like and other numismatic inspired types of charms that like the Korean and Vietnamese variants are derived from Chinese numismatic charms, but have evolved around the customs of the Japanese culture. Although most of these charms resemble Japanese cash coins and the amulet coins of China, they contain their own categories unique to Japan. In the case of these coins, "charm" in this context is a catchall term for coin-shaped items which were not official money. However, these numismatic objects were not all necessarily considered "magical" or "lucky", as some of these Chinese numismatic charms can be used as "mnemonic coins".

Open-work charms are a type of Chinese, Japanese, Korean, and Vietnamese numismatic charms characterised by irregularly shaped "holes" or "openings" between their design elements known as openwork. The design of the amulets represent yin while the holes represent yang and their general purpose was to attract good fortune and ward off evil spirits and misfortune. Unlike most other types of Chinese numismatic charms which usually tend to have square center holes if they’re holed, open-work charms tend to almost exclusively have round center holes though open-work charms with square center holes are known to exist and certain thematic open-work charms that feature human-made constructions mostly told to have square holes. Another distinctive feature of open-work charms is that they’re almost purely based on illustrative imagery and only a small minority of them contain legends written in Hanzi characters. While most other forms of Chinese numismatic charms are made from brass open-work charms are predominantly made from bronze.