Well, yesterday some guy told me the seymour duncan JB's JB stands for jeff beck,like that it's based/designed for/by him.
Now,i dont really belive that, dont why but it seems weird to me.
Can any one confirm i'm wrong/right?
Yeah, that's true.
JB was designed for Jeff Beck, after his guitar was stolen (i guess). I can't find the story of these pickups right now, but someone will give you more details.

Here, i found:

After sending his favorite Les Paul® to a shady repairman who switched out the P.A.F.’s for newer, squealing, pickups, Jeff came to Seymour for help and advice. Seymour repaired Jeff’s Les Paul, and then set about creating a special guitar for Jeff with a pair of pickups that would capture Jeff’s amazing ability to coax a wide range of tones out of his axe.

The result was a guitar that Seymour gave to Jeff as a gift. The body and neck were clearly Telecaster®. But the pickups were two re-wound humbuckers made from broken P.A.F.s Seymour rescued from Lonnie Mack’s Flying V®. Seymour called the guitar a “Tele-Gib,” and nicknamed the bridge pickup “JB” and the neck pickup “JM,” after the hot rod racer, “John Milner,” in the classic film, American Graffiti. (Eventually, “JM” would change to “Jazz Model,” which is what it’s called today.) Jeff used the Tele-Gib on his amazing 1975 release, Blow By Blow, where it gained notoriety for the haunting volume swells heard on “Cause We Ended As Lovers,” which Jeff dedicated to Roy Buchanon. Interestingly, it was Seymour who introduced Jeff to Roy a few months prior.

The JB bridge pickup became very popular, very quick. Soon, many of England’s top guitarists, including more than a few legendary names, sought out Seymour’s “JB Mod” for their guitars. They found that the JB gave increased output (16.4K Ohms) without sounding harsh or dark, like other high-output pickups of the mid-‘70s. When Seymour returned to the USA the next year, his reputation as a pickup designer and the JB’s reputation as a great pickup preceded him. And the rest was history.
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Last edited by juniorlbj at Sep 16, 2009,
like said, JB is the jeff beck model.

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uh its caled signature series products... its very common for all types of gear (pedals, amps, guitars, pickups, etc)