What do the initials in Nike stand for?

Answer 1

The Greek goddess of victory

I assume you mean the "swoosh" which, unlike the name "Nike", has nothing to do with the Greek goddess of victory. The swoosh was designed by a University of Oregon grad student. The only direction given to her was to create a logo that evoked a sense of movement.

Answer 2

The word Nike is a ancient Greek word normally meant in modern times "victory". Nike was the goddess of victory, usually represented as a winged figure carrying a wreath and palm branch. In ancient Greek mythology this meant victory. In USA military terms it was given by the US Army as the name of a surface to air missile with a range of 80 miles. There are also other US missiles that use the word Nike in their names.