BK kosher mark (B with K)BK
Unknown, Unknown
BK
Mark: A large letter 'B' adjacent to a slanted letter 'K'.
Recognized endorsed by 1 major authority
COR
Kosher certification mark shown on the COR card (bottom card).
Shown on the COR Kosher Symbol Reference Card (bottom card, top row) as 'BK'. Issuing agency not explicitly named in English on the card.
How to use this safely: a listing here is not an endorsement. Only trust an authority if one you (or your community) already follow recognizes it — see the “endorsed by” tags above. Standards vary by community and by individual ruling, so always confirm with your rav.