The BMW logo looks roughly like this:
_____
/ \
/ -+- \
/ / | \ \
| |---+---| |
\ \ | / /
\ -+- /
\_______/
The outer ring is black, while the segments of the circle inside are alternating between blue and white. This is supposed to be a stylized image of an
airplane's
propeller; in their early days, BMW made mainly engines for airplanes. Also, white and blue are the traditional colors of
Bavaria.