With acronyms you usually use "a" or "an" based on what the first letter of the acronym sounds like. For example, it would make sense grammatically to use "a" before HSN. But because "H" sounds like it begins with a vowel, you would actually use "an." "An HSN commercial" sounds better than "A HSN commercial."
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BTW (by the way) is an acronym. Anytime you take just the initials of a phrase and use those as capital letters, that is an acronym (literally meaning "high name" because capitol letters are higher).
An acronym is a string of letters standing for the words in a phrase. So no - SCUBA was not a word before it was an acronym. As an acronym SCUBA (Self Contained Underwater Breathing Apparatus) has entered the language and now can stand on its own as a noun -- an aqualung or a verb - scubaed and scubaing, an adjective - the scuba industry. So no an acronym doesn't have to be a word, and just because some become words doesn't mean they should. HAND.
AM is already an acronym for "amplitude modulation", a system where a radio wave carries a signal by varying the amplitude of the wave. It is opposed to FM or "frequency modulation" where the signal is carried by variations in the wave's frequency. AM should not be confused with the acronym am which stands for "ante meridionem", a Latin phrase meaning "before noon".
The acronym DTH can have many meanings, depending on the context of its use. Common meanings for DTH include "Delayed Type Hypersensitivity", "Direct To Home", and "Down The Hall".