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Essentials
Alert, Alarm, bell
Black
512x512
Tiny line
bell, Call, notification
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Education
Flat
Schoolhouse
remind, remember, Notes
Interface
Material Design
reminder, interface, remind
Calendar Icons
birthday, reminder, Calendar
Calendars, plug, electrical
reminder, exclamation, date
Calendar Icons, reminder, day
iOS7 Premium Fill
paper, reminder, remember
Gestures
mind, thought, remember
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Signs & symbols
Glyph
Buttons
Alert, reminder, notification
Teal
UI
Outline
Freeline
Schedule, sound, ringing
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Business & finance
48x48 Free Time Icons
stopwatch, Schedule, reminder
Lavender
48x48