Historical clue formulations

• Letters for those awaiting specifics — 2026-03-14
• Letters for an unscheduled event — 2025-12-14
• Sched. placeholder — 2025-09-05
• Not yet final, in brief — 2025-05-09
• Letters on an incomplete schedule — 2025-04-01
• Schedule inits. — 2024-12-28
• "Check back later," in brief — 2024-12-18
• Letters in an empty slot — 2024-04-12
• Not yet determined: Abbr. — 2023-11-22
• Not yet known, for short — 2023-06-30
• As yet unknown, for short — 2023-06-01
• Pending, on a sched. — 2022-09-19
• Schedule abbr. — 2022-04-29
• "No info yet," on a schedule — 2021-05-16
• Unknown, on a sched. — 2020-12-28
• Schedule abbr. — 2020-10-30
• Timetable abbr. — 2020-08-30
• Abbr. for an open slot — 2019-12-06
• Letters on an incomplete syllabus — 2019-12-01
• Abbr. meaning "We'll fill this slot in later" — 2019-11-20
• "Don't know yet," on a schedule — 2019-04-07
• Not yet on the sched. — 2019-02-28
• Alternative to "?," in some listings — 2019-01-25
• Course list abbr. — 2018-09-05
• Up in the air, for short — 2018-08-16
• Sched. letters — 2018-05-19
• Placeholder letters — 2018-03-25
• Letters on an unfinished sched. — 2018-01-15
• Schedule inits. — 2017-09-10
• "Still open," on a sched. — 2017-08-23
• Letters on a schedule meaning "We'll let you know" — 2017-06-26
• Undecided, on a sked — 2017-05-28
• TV sked letters — 2017-05-03
• [No info yet] — 2017-03-21
• Unknown, on a sched. — 2016-08-24
• Up in the air, as what to air, for short — 2016-06-15
• Not yet posted, on a sked — 2015-07-28
• Not yet available at press time, for short — 2015-06-24
• Alternative to "?" in some listings — 2015-03-21
• Scheduling placeholder — 2014-12-07
• TV schedule abbr. — 2014-05-26
• Not yet filled: Abbr. — 2012-11-07
• Program abbr. — 2012-05-08
• Not yet decided: Abbr. — 2012-02-19
• Sched. letters — 2011-12-31
• Schedule abbr. — 2011-12-29
• "Details forthcoming": Abbr. — 2011-11-20
• Up in the air, for short — 2011-05-07
• Not yet determined: Abbr. — 2011-02-17
• Awaiting scheduling, initially — 2010-12-21