It might stand for several things, of course. For one, "C" is 100, and "D" is 500, in Roman Numerals, so it might mean "5 hundreds in a 500".
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5*100 = 500 c+c+c+c+c = D
#include<stdio.h> int main() { int a,b,c,d; for(a=1; a<5; a++) { for(b=1; b<5; b++) { for(c=1; c<5; c++) { for(d=1; d<5; d++) { if(!(a==b a==c a==d b==c b==d c==d)) printf("dd\n",a,b,c,d); } } } } return 0; }
60%. 65 is usually a D+ and 70 a C.
C = 100 V = 5 D = 500
L=50 c=100 d=500 m=1000