I0 (the letter "I" followed by the digit "0", zero) may refer to:

• Axiom I0: There is a nontrivial elementary embedding of ${\displaystyle L(V_{\lambda +1})}$ into itself with critical point below λ. This is a strong large cardinal axiom of set theory of rank-into-rank type.

I-0 may refer to :

• I-0 (video game), a piece of interactive fiction written by Adam Cadre

• IO (disambiguation) (the letter "I" followed by the letter "O")
• 10 (disambiguation) (the digit "1" followed by the digit "0")
• 1O (disambiguation) (the digit "1" followed by the letter "O")

This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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