Related Clues:

• Course list abbr.
• Details will follow
• TV schedule letters
• Sched. 'question mark'
•     Not yet scheduled, in schedules
• Scheduling abbr.
• Sched. placeholder
• Not yet decided: Abbr.
• Sched. notation
• Sched. slot that's open
• Sched. spaceholder
• "We'll let you know," on a TV schedule
• Schedule maker's abbr.
• Letters of uncertainty
• ''Still open,'' on a sched.