Related Clues:

• Running's three
• Mendon has two
• Naval rank
• Typography units
• Ems divided by two
• Coast Guard officer: Abbr.
• Type widths
• One-striper: Abbr.
• Dash widths
• The two in London
• Two of nine
• There are two to a penny
• Extras
• 'Star Trek' rank: Abbr.
• Wearer of a half-inch gold stripe: Abbr.