The lines are to be two inches wide and of a contrasting color to the court surface, which helps to avoid visual confusion. Generally made of tape for indoor play and paint for outdoor courts, the lines consist of the baselines, which are parallel to the net and at the end of the court; the sidelines, which are perpendicular to the net and run from baseline to baseline; the non-volley zone lines, which run parallel to and seven feet from the net, extending out to the sidelines; the centerlines, which run down the middle from the non-volley zone line to the baseline.
2.1.1. Baselines
The lines parallel to the net at each end of the court.
2.1.2. Sidelines
The lines perpendicular to the net on each long side of the court.
2.1.3. Non-volley zone (NVZ)
The area of court bounded by three lines and the net: the parallel line 7 feet (2.13 m) from the net (non-volley-zone line) and the two sidelines, which are perpendicular to the net. All NVZ lines are inside the NVZ.
2.1.4. Service court
The area on either side of the centerline, including the centerline, sideline, and baseline, excluding the NVZ.
2.1.5. Centerline
The line down the center of the court extending from the NVZ to the baseline separating the odd and even courts.
2.1.6. Right/even court
The service area on the right side of the court when facing the net.
2.1.7. Left/odd court
The service area on the left side of the court when facing the net.