Question

Another kind of word-creation is the acronym, formed by combining the first letters or syllables of a series of words into one. Examples are NATO (North Atlantic Treaty Organization) and NAFTA (North American Free Trade Agreement).

What words are the basis of sonar? Use a dictionary if necessary.

SO for
NA for
R for

Answer 1

Sonar is short for 
So = Sound
Na = Navigation
R = Ranging
I hope this helps :)

Answer 2

SONAR is an acronym as it is a word formed from the initial components (syllabels and letters) of a series of words into one. SONAR is the acronym for Sound Navigation and Ranging, a system that uses sound waves to navigate, communicate with or detect objects under the surface of the water. Consequently, in this acronym SO stands for Sound, NA for Navigation, and R for Ranging.