C/o, ℅ or 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" (where the Universal Widget Company is the intermediary). Look up Letter on Wiktionary, the free dictionary A letter is a written message from one party to another. ...
One can have a sporting career or a musicalcareer, but most frequently "career" in the 20th century referenced the series of jobs or positions by which one earned one's money.
Career counseling provides one-on-one or group professional assistance in exploration and decision making tasks related to choosing a major/occupation, transitioning into the world of work or further professional training.
It is also not uncommon for adults in the late 20th/early 21st centuries to have dual or Multiple Careers, either sequentially or concurrently.