Deci is one-tenth. Bel is for Alexander Graham Bell.
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A tenth of a bel. It's a ratio of two values of the same unit.
The decibel scale is a logarithmic scale. Scroll down to related links and look at "Decibel - Wikipedia" and "Sound level meter - Wikipedia".
There is no point in doing either one of these. A decibel, being the log of a ratio, is added to or subtracted from another decibel.
a decibel meter.
Decibel is no real unit, it is a pseudo unit. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity. A change in voltage ratio by a factor of two is approximately a 6 dB change. A change in power ratio by a factor of two is approximately a 3dB change.