Thank you for the explanation and the link, Marco. I have always wanted to read that text 
So it's both about Greek way of writing numbers and so called monastic sign languages:
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Yet I would say that it's not completely useless for Voynich Manuscript. It shows that people in medieval ages were conscious about different numeric systems. In Roman numerals only few letters are used like I, V, X, L, C, D, M. But in other systems (Greek, Hebrew, Slavonic) every letter is used and every letter means some number.
So if letters may mean numbers then numbers may mean letters, right? And you can code letters with numbers. And Voynich vords are similar to Roman numbers.
Today a lot of ciphers use numbers and such numeric ciphers appeared already in the 1500s. See the great website Cryptiana for such stuff ( You are not allowed to view links. Register or Login to view. )
But in the 1400s there were no numeric ciphers or almost no numeric ciphers. They became a standard when Arabic numbers became a standard. Voynich Manuscript seems out of place here, like someone was coding words with some mutated Roman numerals.
So it's both about Greek way of writing numbers and so called monastic sign languages:
You are not allowed to view links. Register or Login to view.
You are not allowed to view links. Register or Login to view.
Yet I would say that it's not completely useless for Voynich Manuscript. It shows that people in medieval ages were conscious about different numeric systems. In Roman numerals only few letters are used like I, V, X, L, C, D, M. But in other systems (Greek, Hebrew, Slavonic) every letter is used and every letter means some number.
So if letters may mean numbers then numbers may mean letters, right?
And you can code letters with numbers. And Voynich vords are similar to Roman numbers.Today a lot of ciphers use numbers and such numeric ciphers appeared already in the 1500s. See the great website Cryptiana for such stuff ( You are not allowed to view links. Register or Login to view. )
But in the 1400s there were no numeric ciphers or almost no numeric ciphers. They became a standard when Arabic numbers became a standard. Voynich Manuscript seems out of place here, like someone was coding words with some mutated Roman numerals.