Related Clues:

• ''I'll tell you later,'' TV Guide-style
• Timetable letters
• 'Check back later' letters
• Placeholder letters
• Letters in an incomplete schedule
• Letters in an unfilled sched. slot
• Not scheduled yet: Abbr
• Undecided, on a sched
• 'We'll let you know later': Abbr
• Not yet decided, briefly
• Not yet decided (Abbr.)
• 'Don't know yet,' on skeds
• "Don't know yet," on skeds
• Alternative to '?,' in some listings
• Place-holding abbr