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What would the D stand for in SS/DH or SS/DA ? I know D class, but what would be D class

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Of course the D is for class D which is a certain weight they run as per the NHRA HP rating. So if the D class was just say for an example 10 lbs per each HP that is multiplied by the NHRA HP rating. So if it was a 400 hp rated eng it would be 10 x 400 or 4000 lbs. Get it ?? Real easy ey ? It can get real confusing as I just used the 10 lbs as an example but the faster classes like SS/A or SS/B might be 7 lbs per HP where the slower classes like SS/E or SS/F might be 8.7 lbs per HP. And NHRA refactors from factory HP ratings. Like the 426 Hemi is 425 HP but NHRA will rate it about 500 or so. Thats also why racers hate when NHRA adds HP as that means they have to run more weight in the car to be legal. Ron