omen, clue, token, caution; see sign 1, warning.
"portent." YourDictionary, n.d. Web. 15 September 2018. <http://thesaurus.yourdictionary.com/portent>.
portent. (n.d.). Retrieved September 15th, 2018, from http://thesaurus.yourdictionary.com/portent
A phenomenon that serves as a sign or warning of some future good or evil:
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