def get_short_name(self):
        """
        Returns the short type name of this X.509 extension.

        The result is a byte string such as :py:const:`b"basicConstraints"`.

        :return: The short type name.
        :rtype: :py:data:`bytes`

        .. versionadded:: 0.12
        """
        obj = _lib.X509_EXTENSION_get_object(self._extension)
        nid = _lib.OBJ_obj2nid(obj)
        return _ffi.string(_lib.OBJ_nid2sn(nid))