B.B.C.

BBC bbc English Proper noun en dated now _ rare en BBC. Usage notes Using a full stop for all acronyms was a common practice in the early to mid 20th century. "BBC" surpassed the original "B.B.C." during the 1940s, though the latter remained as an infrequent variant for decades afterwards.https://books.google.com/ngrams/graph?content=B.B.C.%2C+BBC&year_start=1800&year_end=2022&corpus=en&smoothing=3 The BBC's current style guide, and British English generally, prefers "BBC".