cause it’s literally the minimum amount of points you can score.
Readers added context they thought people might want to knowReaders added context
Actually, the lowest possible score in football would be 1 point earned on a safety during an extra point(s) attempt:
NFL Rules
Section 1 - Value Of Scores
Article 2. Types Of Scoring Plays
(d) Try after touchdown: 1 point (Field Goal or Safety) or 2 points (Touchdown)
operations.nfl.com/the-rules/nfl-…
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