Depends on the context. Originally it was the name of Thor's hammer in Norse mythology. Not a acronym at all.
The 13 stars stand for the 13 colonies
Custer's Last Stand-up was created in 2001.
it stand for Association Of Community Organizations For Reform Now
During world war two what did the abbreviation "GI" stand for???
Custer - though his last stand was several years after the war.
Mjolnir LLC was created in 2001.
Thor's hammer's name was Mjolnir, and translated as "crusher".
MEE-YOLL-NER. This literally means "The Thing that Smashes" mjolnir,
Mjolnir
some may try to pronounce mjolnir, but no, it is the mighty Johnathan
probably
Mjolnir.
A mjolnir is the hammer of Thor in Norse mythology. This is slightly different from the comic book version of Thor and his hammer. It is a formidable weapon that has great power; several other Norse gods have tried to harness it's power and failed.
MJOLNIR mix
Thor is often showed using a hammer or mjolnir.
For an image of Mjolnir see link.
Thors weapon is commonly known as a war hammer or a mjolnir.