The term "iodide of million base" is not a standard chemical term, and there is no known chemical compound with that name.

It's possible there's a misunderstanding or a typo in the name. Could you please clarify what you're looking for?

Here are some possibilities:

* Iodide ion: This is the simple anion with the formula I⁻.

* Iodide salts: These are compounds formed by combining an iodide ion with a cation. Examples include sodium iodide (NaI), potassium iodide (KI), and calcium iodide (CaI₂).

* Organic iodides: These are organic compounds containing an iodine atom. Examples include methyl iodide (CH₃I) and ethyl iodide (C₂H₅I).

Please provide more context or specify the specific compound you're interested in, and I'll do my best to help.