Reminder

Noun

 * 1) Someone or something that reminds.
 * He left a note as a reminder to get groceries.

Thesaurus
admonition, adversaria, aide-memoire, annotation, cue, docket, entry, flapper, footnote, gesture, hint, indication, intimation, item, jogger, jotting, keepsake, marginal note, marginalia, memento, memo, memoir, memorandum, memorial, minutes, mnemonic, notation, note, notice, prompt, prompter, prompting, refresher, register, registry, relic, remembrance, remembrancer, scholia, scholium, sign, souvenir, suggestion, tickler, token, trophy, warming

Etymology
to remind + -er

Translations

 * Czech: připomínač, připomínka , upomínka ,
 * Danish:
 * French:


 * Macedonian: потсетник
 * Norwegian: påminnelse
 * Spanish: aviso recordatorio