Question

What is the full name of the unit used to measure sound level?

Answer 1

A sound unit is any acoustic unit of soundmeasurement.

dB, decibel - noise of sound measurement is called decibels (dB). Ratio of the sound pressure to reference pressure to something.

sone - a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold, starting with 1 sone.

phon - a unit of subjective loudness.

Hz, hertz = unit of sound frequency is called hertz (Hz)

Answer 2

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.

Full form of SI unit is systeme international which is abbreviation from the French systeme international.