Related Clues:

• Sentence stopper
• Sentence-ending mark
• Sentence ending
• Stop sign?
• Stretch of time
• Class day division
• '... and that's final!'
• End of story
• ". . . and that's final!"
• "... and that's final!"
• The point of writing?
• Meaningful interval
• Class length
• Duration or interval
• Interval of time or a full stop