Related Clues:

• Naval rank
• Typography units
• Ems divided by two
• Coast Guard officer: Abbr.
• Driller: Abbr.
• Type widths
• O'Rourke, e.g., of 'F Troop': Abbr.
• Abbr. before Friday
• One-striper: Abbr.
• Dash widths
• The two in London
• Two of nine
• Dictionary section
• There are two to a penny
• 'Star Trek' rank: Abbr.