reminder

[ri-mahyn-der]
noun
a person or thing that serves to remind.

Origin:
1645–55; remind + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reminder (rɪˈmaɪndə)
 
n
1.  something that recalls the past
2.  a note to remind a person of something not done

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The trip was a great reminder of why once you're a desert rat, you're always a
  desert rat.
Landscape photographs printed on foam core are a sweet reminder of a favorite
  place.
Good or bad, history should be preserved as a reminder of what once was.
My favorite flowers, tulips, produce an irritating sap-a reminder to wear my
  garden gloves when planting bulbs.
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