The BIMI Record Lookup / BIMI Check is a diagnostic tool that will look for a BIMI Record for the queried domain name, display the BIMI Record (if found), and run a series of diagnostic checks against the record.
Brand Indicators for Message Identification (BIMI) is an industry-wide standards effort to use brand logos as indicators within email mailboxes to help email recipients recognize and avoid fraudulent messages. This standard is still currently in beta: Several brands from Verizon Media (Yahoo!, AOL, etc.) testing this concept in front of their mailbox users. Gmail will introduce a BIMI beta program in 2020. To learn more about what BIMI Records are and their value to email delivery you can read more about BIMI Records here.