Answer: periods

AnswerCrossword Clue
PERIODSStops.
periodsthe mark (.) indicating the end of a sentence
periodsoccurrence of menstruation
periodsportion of time
PERIODSTiny characters in "E.T."
PERIODSThree, in a hockey game
PERIODSDots
PERIODSPhases
PERIODSDivisions of hockey games
PERIODSSome book ends
PERIODSDivisions of a hockey game
PERIODSGame segments
PERIODSIntervals.
PERIODSClass hours.
PERIODSStopping points
PERIODSStopping points.
PERIODSAges.
PERIODSPunctuation marks.
PERIODSQuarters.
PERIODSStages of life.
PERIODSTime intervals
PERIODSEras
PERIODSSentence-ending marks
PERIODSGame divisions
PERIODSSentence stoppers
PERIODSSentence enders
PERIODSLunch and study hall
PERIODSHockey game divisions