First of all I was referring to a 2 team tie. But here’s the rules on 3 teams.
Three or More Clubs
(Note: If two clubs remain tied after third or other clubs are eliminated during any step, tie breaker reverts to step 1 of the two-club format).
- Head-to-head (best won-lost-tied percentage in games among the clubs).
- Best won-lost-tied percentage in games played within the division.
- Best won-lost-tied percentage in common games.
- Best won-lost-tied percentage in games played within the conference.
- Strength of victory.
- Strength of schedule.
- Best combined ranking among conference teams in points scored and points allowed.
- Best combined ranking among all teams in points scored and points allowed.
- Best net points in common games.
- Best net points in all games.
- Best net touchdowns in all games.
- Coin toss
- https://www.nfl.com/standings/tie-breaking-procedures