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What does "FB" mean? I can only guess it's some kind of protective device because of F, like with FU for fuse.

Is there any comprehensive online guide for such kind of symbols?

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    \$\begingroup\$ Can you provide an example schematic? \$\endgroup\$ – Renan Jul 11 '13 at 14:39
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    \$\begingroup\$ This symbol was on power source board. The device itself is small black ("metallic") cylinder without any visible signs on it. There were 3 of them. \$\endgroup\$ – Roman Susi Jul 11 '13 at 14:42
  • \$\begingroup\$ Can you provide image? \$\endgroup\$ – Always Confused Jul 1 '16 at 19:18
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From your description, sounds like an abbreviation for Ferrite Bead.

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  • \$\begingroup\$ There is no other explanation. Its magnetic, resistance is minimal in both directions, appears among jumpers, color is right. And it is also protective device. Thanks. \$\endgroup\$ – Roman Susi Jul 11 '13 at 14:55
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FB is the designator for a ferrite bead. A FB acts a lot like an inductor, in that it filters out AC, and they slow transition of DC signals.

Best list of designators I've run across is in Wikipedia.

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