Meaning Care of
Type Acronym
Rank ★ ☆ ☆  Uncommon
Usage General (not just online)
Comments C/O is often used to identify a specific recipient when shipping a package to a business or organization with many people. It may also be used, though perhaps tongue-in-cheek, to specify an email recipient when sending a message to multiple people.
Example "c/o: Kate Keller"
Updated December 26, 2012