Greek fractions

[Raymond Mercier]

In Classical Greek scientific texts the fraction 'one half' is represented very commonly by a symbol which looks a bit like 'less than', or like 'angle' U+2220, but followed by a prime. Is there no place for this in the Unicode scheme of things ?
Other symbols are also found for common fractions, apart from the general usage where a prime is added to indicate the reciprocal.
I have been converting some TLG* files to Unicode, and I notice that even in the original TLG file the symbol is just replaced by a space. This makes a nonsense of Ptolemy's geographical coordinates.

*TLG = Thesaurus Graecae Linguae

Raymond Mercier