What does OE stand for?

Is there an index that shows what commonly used abbreviations mean?

What is the purpose of a sway bar? I do not see why it would be needed..Thanks in advance

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.