出典:Wiktionary
Care of, usually abbreviated as ℅ on envelopes, signifies an intermediary who is responsible for transferring a piece of mail between the postal system and the final recipient. For example, when the final recipient (person または business A) has no address itself, the mail sender may want an intermediary (person または business B) who has an address to manually forward the mail to the final recipient. An example:
In Australia and New Zealand c/- is often used in place of ℅.