Jot - Vine's Expository Dictionary of New Testament Words

Jot

[ 1,,G2503, iota ]
from the Heb. yod, the smallest Hebrew letter, is mentioned by the Lord in Matthew 5:18 (together with keraia, a little horn, a tittle, the point or extremity" which distinguishes certain Hebrew letters from others) to express the fact that not a single item of the Law will pass away or remain unfulfilled.

Vine's Expository Dictionary of New Testament Words