The arabicaArabica refers to Coffea Arabica, the taxonomic species name of the genus responsible for around 75% of the worlds commercial coffee crop.: Arabica refers to Coffea Arabica, the taxonomic species name of the genus responsible More coffee plant was brought to Indonesia
USDA is (obviously) the United States Department of Agriculture. USDA also had coffee plant breeding programs in the past and one variety they distributed to Indonesia and was widely planted is called USDA (sounds like More from India
S-795 is a variety based on the " S-Line" coffees of India, and stands for Selection 795, It has a very fine cup, one of the best in Indonesia, but is not a high volume More in 1696. Java
There are several types of Abyssinia, but they are not from Ethiopia but rather Indonesia. Abyssinia 3 = AB3. PJS Cramer, a Dutch plant researcher, introduced this variety in 1928, supposedly from Ethiopia seed stock. It was More coffee had a legendary status around the world until the last century.