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The abbreviation for abbreviation is "abbr."
"GPA" is already an abbreviation for "grade point average". There is no further abbreviation for the abbreviation.
You do not. You see it stereoscopically, but the brain compares the images with experience and assumes threedimensional interpretations. This can be used to fool people with optical illusions. Forms that are possible in a twodimensional world, but does not have a representation in 3D that makes sense.
Yes, abbr is the abbreviation of the word abbreviation or abbreviate.
MN is not an abbreviation for millions.