I have seen this question but I can't seem to find a meaning for DB. What does DB mean?

Circuit from Plasma Lamp

DB DB Symbol

Circuit from Fluorescent Light bulb

Even my lucky light bulb has it! Light Bulb

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    \$\begingroup\$ Can you post a photo of where you found it? \$\endgroup\$ Aug 24 '16 at 0:01
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    \$\begingroup\$ @Sigma6RPU I know that it is a little far-fetched but is there any case that is means decibel (dB) and it was just printed with all caps? \$\endgroup\$
    – Adam
    Aug 24 '16 at 0:08
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    \$\begingroup\$ Any chance that it might be a bi-directional diac? \$\endgroup\$ Aug 24 '16 at 0:15
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    \$\begingroup\$ The symbol is for a "Gunn Diode" apparently. The fact there seems to be no DB1 or DB2 indicate to me that the name is not necessarily an acronym for the name of the component but possibly something else that the designer had in mind. \$\endgroup\$
    – Wesley Lee
    Aug 24 '16 at 0:27
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    \$\begingroup\$ a-ha (Dwayne was right): edaboard.co.uk/fluorescent-lamp-circuit-board-t152186.html \$\endgroup\$
    – Wesley Lee
    Aug 24 '16 at 0:29

Judging by the silkscreen symbol , it appears to be a BIdirectional Tranzorb or TVS which has bipolar Zener diode like properties useful for spike clipping.

DB = Diode Bidrectional vs unipolar.

A new REFDES invention it seems. (reference designator)

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    \$\begingroup\$ I've always heard it as REFDES. \$\endgroup\$ Aug 24 '16 at 0:58
  • \$\begingroup\$ me too. but fat fingers on an iPad can play tricks even trying to correct spelling incorrectly. \$\endgroup\$ Aug 24 '16 at 1:06

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