Even though the acronyms stand for words in non-English language, nobody's explained what they mean in actual practice.
ORTF - Mics spread with capsule centers 17cm apart and mics pointed capsules outward from each other with 110 degrees of angle between them.
DINa - Mics spread with capsule centers 17cm apart and mics pointed capsules outward from each other with 90 degrees of angle between them.
DIN - Mics spread with capsule centers 20cm apart and mics pointed capsules outward from each other with 90 degrees of angle between them.
NOS - Mics spread with capsule centers 30cm apart and mics pointed capsules outward from each other with 90 degrees of angle between them.
XY 90 - Mics coincident and mic capsules pointed inward with 90 degrees of angle between them. Coincident means that the the capsules are directly on top of each in a vertical plane.
XY 120 - Mics coincident and mic capsules pointed inward with 120 degrees of angle between them.
YMMV = your mileage may vary
OTOH = on the other hand
PITA = pain in the ass
I thought QFT meant Quite Freakin True although an earlier response provided a different meaning.
...and a famous taperssection acronym
STFU = shut the f*** up
...but the most famous of all
bip bip = bump