I was just wondering what the W stands for in all MB chassis numbers, and why is the 107 chassis, a R. Now I can guess that the R might be for roadster, but what is W for in the coupes and sedans? Also does anyone know the rhyme or reason to MB jumping from W114,W115,W116, then build a W126. They made the W123 to then be replaced by the W124, but where is the W125.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member