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algebra? The unknown numbers of which you speak are called variables. "algebra" oxford dictionary definition = investigation of properties of numbers using letters etc as general symbolsAll branches of mathematics have the opportunity to utilize letters instead of numbers. This is called a variable and they are found in every branch of mathematics.
Alphanumerical is consisting of letters and numbers.
Maths are equations using letters or numbers.
To write 24 January 2014 in 5 letters without using numbers kindly write 24.1.14.