http://www.nrel.gov/wind/pdfs/34382.pdf
"The yaw movement can be prevented with a yaw lock that is engaged at the tower top"

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Note added at 2 hrs (2011-10-06 00:14:00 GMT)
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http://dictionary.reference.com/browse/yaw

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Note added at 2 hrs (2011-10-06 00:16:29 GMT)
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http://encyclopedia2.thefreedictionary.com/Yaw (disambiguati...

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Note added at 2 hrs (2011-10-06 00:17:43 GMT)
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http://en.wiktionary.org/wiki/yaw?rdfrom=Yaw

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Note added at 2 hrs (2011-10-06 00:18:39 GMT)
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http://en.wikipedia.org/wiki/Yaw_drive

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Note added at 2 hrs (2011-10-06 00:18:59 GMT)
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http://en.wikipedia.org/wiki/Yaw_system

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Note added at 2 hrs (2011-10-06 00:19:40 GMT)
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the last two and the first are about wind turbines

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Note added at 2 hrs (2011-10-06 00:23:41 GMT)
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http://webcache.googleusercontent.com/search?q=cache:HFXw1eM...
Qui "yaw" è tradotto con "imbardata" come nel campo nautico

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Note added at 2 hrs (2011-10-06 00:25:01 GMT)
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http://www.proz.com/kudoz/english_to_italian/energy_power_ge...
da kudoz. vedi anche "yaw control"

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Note added at 2 hrs (2011-10-06 00:30:30 GMT)
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in definitiva si tratta di uno strumento per il controllo della stabilità della turbina

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Note added at 2 hrs (2011-10-06 00:31:30 GMT)
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The Wind Turbine Yaw Mechanism
http://www.motiva.fi/myllarin_tuulivoima/windpower web/en/to...

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Note added at 2 hrs (2011-10-06 00:33:53 GMT)
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http://www.nextville.it/index/523

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Note added at 2 hrs (2011-10-06 00:44:15 GMT)
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https://docs.google.com/viewer?a=v&q=cache:RJq-mQ7gaGQJ:www....

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Note added at 3 hrs (2011-10-06 00:47:09 GMT)
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In terms of apparatus, the invention provides a yaw lock which is useful in a wind turbine generator system in which a bladed rotor is rotatable about a substantially horizontal axis and is carried by a nacelle assembly which is rotatable about a substantially vertical yaw axis relative to a supporting tower atop which the nacelle assembly is carried. The yaw lock is releasibly attachable to the nacelle assembly and to the tower for essentially rigidly securing the nacelle from rotation about the yaw axis. Use of the yaw lock across the connection of the nacelle to its supporting tower facilitates accurate measurement of unbalance in the rotor.
http://www.freepatentsonline.com/5140856.html

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Note added at 3 hrs (2011-10-06 00:50:16 GMT)
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http://www.proz.com/kudoz/spanish_to_english/energy_power_ge...
Yaw lock <--> yaw brake

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Note added at 3 hrs (2011-10-06 00:53:16 GMT)
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traduzione possibile: "freno d'imbardata"