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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
UI
Outline
Freeline
Schedule, sound, ringing