Related Clues:

• Typography units
• Ems divided by two
• Coast Guard officer: Abbr.
• Type widths
• One-striper: Abbr.
• Dash widths
• The two in London
• Two of nine
• Dictionary section
• There are two to a penny
• 'Star Trek' rank: Abbr.
• Wearer of a half-inch gold stripe: Abbr.
• Some dashes
• Lt. j.g.'s inferior
• Northern borders?