Each interviewer scores you - across four categories: Algorithms, Coding, Communication, and Problem-Solving.
A means clean working code, no syntax errors, asked clarifying questions, and had time for follow-ups. A means working code with minor issues, less time for discussion. A means partially correct code and required multiple hints. A means could not reach a solution.
Interviewers also give an overall recommendation from Strong No-Hire to Strong Hire.