Initialism of binary search tree.
"The computer science professor explained that a bst is a data structure used to efficiently store and retrieve sorted values."
In plain English: A bst is an acronym for best, used to show that something is better than anything else.
"The bst in this stew is made from fresh carrots and onions."
Initialism of British Standard Time (between 1968 and 1971)
"During that brief period in the late sixties, bst was used to refer to the time zone observed before Greenwich Mean Time became standard again."