Sonído

is a high-speed movement technique of the Arrancar. It is equivalent to the Shinigami's Shunpo and the Quincy's Hirenkyaku, which are roughly equal in terms of speed.

Description
While somewhat similar to Hohō in regards to function and speed, Sonído appears to be more instinctual, seemingly requiring no previous knowledge to perform. It produces a different sound; rather than the swishing or sometimes silent Shunpo of the Shinigami, Sonído makes a booming or static noise. Though the technique is exhibited by most Arrancar, the proficiency with which it can be performed is limited only by the individual, with Zommari Rureaux possessing the fastest Sonído among the Espada. Coyote Starrk is also a notable user of Sonído, being able to cover tremendous distances at such speed that his Sonído seems akin to teleportation.

Trivia

 * While the accurate spelling of the word in Spanish would be "Sonido", it is spelled as "Sonído" in official translations.

Appearances in Other Media
Ryōgo Narita's novel Bleach: Can't Fear Your Own World establishes that Sonído differs from Hohō and Hirenkyaku by not exerting any Reiatsu during use, thereby making the user more difficult to detect when moving. Due to this, Sonído is more practical for hit-and-run tactics.