The Iota reference article from the English Wikipedia on 24-Apr-2004
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Iota

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Greek letters
Α α Alpha Β β Beta
Γ γ Gamma Δ δ Delta
Ε ε Epsilon Ϝ ϝ Digamma
Ζ ζ Zeta Η η Eta
Θ θ Theta Ι ι Iota
Κ κ Kappa Λ λ Lambda
Μ μ Mu Ν ν Nu
Ξ ξ Xi Ο ο Omicron
Π π Pi Ϻ ϻ San
Ϙ ϙ Qoppa Ρ ρ Rho
Σ σ Sigma Τ τ Tau
Υ υ Upsilon Φ φ Phi
Χ χ Chi Ψ ψ Psi
Ω ω Omega Ϡ ϡ Sampi
Greek alphabet

Iota (upper case Ι, lower case ι) is the 9th letter of the Greek alphabet. In the system of Greek numerals it has a value of 10.

The word iota is also used in English to express a very small amount. By some accounts this usage stems from the third- and fourth-century theological dispute over the Arian doctrine that Jesus and God the Father were of distinct but similar substances—Greek homoi-ousios—against the orthodox doctrine that they are one substance—Greek homo-ousios. The two words differ by one iota.

Letters that arose from Iota include the Roman I.