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Aug 23, 2014 · Our numbers have a specific two-letter combination that tells us how the number sounds. For example 9th 3rd 301st What do we call these special sounds? What is the most correct form for 3 in ordinal form: 3rd or 3d? I know both are valid. But I heard that 3rd is something like spoken form and it's grammatically correct to use 3d. When we use words like first, second, third, fourth or 1st, 2nd, 3rd, 4th, in sentences, what will be the best way to write these? Also, what about numbers? Do we put them as numbers or numerals? . When were numeric contractions for ordinals first used, as in 1st, 2nd, 3rd, 6th instead of first, second, third, sixth?