I know I found this documented once ... and I think I even documented where the documentation was ... but I'm just not finding it. Among the places it is used is in the Bible Sense Lexicon.
Orthodox Bishop Hilarion Alfeyev: "To be a theologian means to have experience of a personal encounter with God through prayer and worship."
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On the wiki page for the Bible Sense Lexicon, it states "The symbol ⇔ means that the words are materially equivalent."
Thank you, Nick