American football field

The 100 yards between the goal lines where most gameplay occurs is officially called the field of play in the NFL rulebook.

The end zones are where touchdowns, two-point conversions, and safeties are scored, and where touchbacks occur.

Team or league logos or other patterns may be painted inside the end zone as long as they do not interfere with the mandatory field markings.

The NFL requires a ribbon to be attached to the top of each goal post to indicate wind direction and speed.

NFL rules call for the bottom edge of each number to be 12 yards from the sideline.

The hash marks (officially inbounds lines in the NFL rulebook) are two rows of short lines running the length of the field that mark the boundaries of where a scrimmage down may start.

In the NFL and most forms of indoor football, the hash marks are in line with the goalposts.

College and high school football fields have hash marks that are significantly wider than the goal posts.

A small X may be painted at the center of each 35-yard line on NFL or college fields to indicate the spot where kickoffs take place.

Most professional and collegiate fields have a team or league logo painted at the 50-yard line.

According to the high school rulebook recommendations, the field should be angled (or "crowned") at approximately 1.2° (rising 1⁄4 inch per foot, or 1 in 48) upward from each sideline to the center of the field so that the center is 20 inches (51 cm) higher than the sidelines, allowing proper drainage.