iota

noun

1. The ninth letter of the Greek alphabet (Ι, ι).

   “As a Greek numeral, iota represents ten.”

   “There are twelve iotas on that page.”

   “Human ill-nature needs but some Homoiousian iota, or even the pretence of one; and will flow copiously through the eye of a needle: thus always must mortals go jargoning and fuming […].”

2. The Latin letter Ɩ (minuscule: ɩ).
3. A jot; a very small, insignificant quantity.

   “They never depart an iota from the authentic formulas of tyranny and usurpation.”

   “His expression had not changed one iota except perhaps for an additional tightening of his lips.”

   “[E]very iota of its gravitic power.”

   “It was because Sanchez didn't have an iota of faith in what he was saying.”

4. A bank account that earns interest and pays it to a third party, generally a charity; the principal is typically being held in escrow by the accountholder.