Greek question mark and english semicolon

[John Salatas]

Hello,
just noticed that in the Unicode character table there is a special character 
(037E) for the Greek quotation mark.
Under X Windows (and also in other Operating Systems) this character is not in 
use (am I correct?) but is used the equivalent English semicolon (003B).
Is this a bug or is intentionally this way?

Please, if possible reply in English.

Thank you.