Initialism of level of consciousness; also LoC.
"The editor invited readers to submit a loc responding to last month's controversial review."
A dreadlock.
Alternative letter-case form of LOC.
Correspondence, usually a letter, sent to a periodical commenting on either the contents of a previous issue or an earlier letter of comment.
In plain English: A loc is an informal word for place, often used to describe where something happens or exists.
"The loc was found to have been damaged during transport."
To write a letter of comment to a periodical.
"The editor invited several readers to loc their thoughts on the latest news story."
In plain English: To loc means to find something by looking around for it.
"Please stop locing in your friends and let them come over for dinner without an appointment."
Initialism of Library of Congress.
"The library catalog was updated to use LOC as a shorthand for Library of Congress in all official documents."
The word loc is a clipping of the term dreadlock. It entered English as a shortened form to refer specifically to these hairstyles.