American Football NCAA Rule 1-2-1

The field shall be a rectangular area with dimensions, lines, zones, goals and pylons as indicated in Appendix D.
a. All field-dimension lines shown must be white and 4 inches in width (Exceptions: Sidelines and end lines may exceed 4 inches in width, goal lines may be 4 or 8 inches in width, and Rule 1-2-1-g).
b. Twenty-four-inch short yard-line extensions, four inches inside the sidelines and at the hash marks, are mandatory; and all yard lines shall be four inches from the sidelines (Rule 2-12-6).
c. A solid white area between the sideline and the coaching line is mandatory.
d. White field markings or contrasting decorative markings (e.g., team names) are permissible in the end zones but shall not be closer than four feet to any line.
e. Contrasting coloring in the end zones may abut any line.
f. Only these contrasting decorative markings are allowed: conference logo, NCAA logo, college or university name and logo, and team name and logo. These are permissible within the sidelines and between the goal lines, under these conditions (See Appendix D):
1. The entirety of all yard lines, goal lines, and sidelines must be clearly visible. No portion of any such line may be obscured by decorative markings.
2. No such markings may touch or enclose the hash marks or numbers.
3. A single decorative marking, centered on the 50-yard line, and a maximum of four smaller flanking decorative markings are allowed.
g. Goal lines may be of one contrasting color from the white lines.
h. Advertising is prohibited on the field except as follows:
1. For postseason and neutral-site games the title sponsor whose name is associated with the name of that game may advertise on the field, with the restriction that there be a maximum of three such advertisements: a single advertisement centered on the 50-yard line and no more than two smaller flanking advertisements. These advertisements must adhere to paragraph f above. No other advertisements, either by the title sponsor or by any other commercial entity, may be on the field.
2. The NCAA Football logo is permitted.
3. If a commercial entity or individual has purchased naming rights to the stadium, facility, or field, that entity’s or individual’s name/company-specific font or logo may be painted on the field in no more than two of the flanking locations and will count in the total of the maximum of four flanking locations allowed.
i. White field yard-line numbers not larger than 6 feet in height and 4 feet in width, with the tops of the numbers nine yards from the sidelines, are recommended.
j. White directional arrows next to the field numbers (except the 50) indicating the direction toward the nearest goal line are recommended. The arrow is a triangle with an 18-inch base and two sides that are 36 inches each.
k. The two hash marks are 60 feet from the sidelines. Hash marks and short yard-line extensions shall measure 24 inches in length.
l. Nine-yard marks 12 inches in length, every 10 yards, shall be located nine yards from the sidelines. They are not required if the field is numbered according to Rule 1-2-1-i.