Iota
WordNet
noun
(1) The 9th letter of the Greek alphabet
(2) A tiny or scarcely detectable amount
WiktionaryText
English
Noun
- The ninth, and smallest, letter of the Greek alphabet.
- As a Greek numeral, iota represents ten.
- A printed or computer-stored instance of that ninth letter.
- There are twelve iotas on that page.
Etymology 2
From the difference between and in Christology, the names of those two competing viewpoints differing only by one ι.