What does the letter O commonly stand for when players use single-letter shorthand?

• A. Defense
• B. Offense
• C. Out-of-bounds
• D. Onside

Answer: (B)

In single-letter shorthand, the letters on the field mark which side has possession and is on offense versus defense. The letter O stands for offense because it represents the team currently in possession, the one trying to advance the disc toward the end zone. When a team gains control, the status flips from defense to offense, and the shorthand reflects that with O for the offensive side and D for the defensive side. The other options don’t fit because defense is labeled with D, not O; out-of-bounds refers to a boundary condition and isn’t a possession label; onside isn’t a standard shorthand used in this context.