[ἰῶτα] of Hebrew origin (the tenth letter of the Hebrew alphabet); "iota", the name of the eighth letter of the Greek alphabet, put (figuratively) for a very small part of anything
Usages throughout the bible
Matthew 5:18
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For verily I say unto you, Till heaven and earth pass, one jot G2503 or one tittle shall in no wise pass from the law, till all be fulfilled.