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If you're referring to the forms of a Zanpakuto, there are three levels:

Unreleased form, Shikai release, and Bankai release.

Also, Espada have three levels. Essentially they are the same, but with different names: Unreleased form, Resureccion release, and second release. (only Ulquiorra Cifer has shown the ability to perform a second release).

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