What is another word for polyphonic letter?
Pronunciation: [pˌɒlɪfˈɒnɪk lˈɛtə] (IPA) 
The term "polyphonic letter" can be quite complicated to understand for those who are not familiar with music. Therefore, it is useful to have synonyms to describe it. One possible synonym could be "voice doubling," which refers to the practice of writing two or more identical melodies simultaneously. Another possible synonym is "multi-voiced," which refers to music that contains several independent lines or voices. Similarly, "contrapuntal" could be used to describe music that has multiple voices or melodies that are interwoven. Finally, "counterpointed" could be used to describe music that has two or more melodies that are played or sung simultaneously but are distinct from one another.
