They actually ends, and there just exists ten number really, 0,1,2,3,4,5,6,7,8,9 all the other number are just one after other
Those are just ways of representing numbers. If we count in roman numerals we have I, II, III, IV, V, VI, VII, VIII, IX, X. Here there is only 3 symbols used, but then again, these symbols were only used to represent the numbers and aren't the numbers themselves.