In regards to the anime Bleach, a shikai is the first release of a zanpakuto, the sword used by shinigami. Each shikai has a special ability.

To release the shikai form of a zanpakuto, one must call it's name (eg; "Scatter, Senbonzakura", "Awaken, Benihime", "Dance, Sode no Shirayuki"). This is no longer necessary when one has attained bankai, the second release.
Some shikai releases are...
Hitsugaya's Hyourinmaru- takes the form of an ice dragon
Renji's Zabimaru- a sword that can be extended into different segments
Ichigo's Zangetsu- a gigantic butcher-knife type sword
Matsumoto's Haineko- a disintegrated sword
Kira's Wabisuke- turns into a square spiral
by Bobbity Bob December 26, 2007
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Did you hear about Shikai Yun?
No who’s that.
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kai and shi mei soulmates. it's canon. anyone who believes otherwise is a mo ran 1.0
shikai married. i take no arguments.
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