Roman numerals
The roman numerals are made of 7 basic symbols I - 1 V- 5 X - 10 L - 50 C - 100 D - 500 M - 1000 These are roman numerals from 1 -30 I -1 XI - 11 XXI- 21 II - 2 XII - 12 XXII - 22 III - 3 XIII - 13 XXIII - 23 IV - 4 ...