NFL Rule 5, Section 1, Article 4

[xoxoxoBruce]

(NFL Rule 5, Section 1, Article 4)

All players must wear numerals on their jerseys in accordance with Rule 5, Section 3, Article 3c (see NOTE 1), and such numerals must be by playing position as follows: quarterbacks, punters, and placekickers, 1-19 (and 10-19 for wide receivers if 80-89 are all otherwise assigned); running backs and defensive backs, 20-49; centers, 50-59 (60-79 if 50-59 unavailable); offensive guards and tackles, 60-79; wide receivers and tight ends, 80-89; defensive lineman, 60-79 (90-99 if 60-79 unavailable); and linebackers 50-59 (90-99 if 50-59 unavailable).

Is that clear?