A prefix (form of com-, signifying with, together, in conjunction, joint)
c/o can stand for:
"Care of", used to address a letter when the letter must pass through an intermediary (for example, "John Smith, c/o the Universal Widget Company).
This page expands and disambiguates a two-letter combination which might be an abbreviation, an English word, a word in another language, any or all of these. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.