A Bulgarian friend of mine told me that at school, when the teachers wanted to sum over several lines, they wrote
$$ \left. \begin{array}{l} a-b\\c-d\\e-f\\g-h \end{array} \right\} /+ \qquad\text{meaning what we would write as}\qquad \begin{array}{l} (a-b)+{}\\(c-d)+{}\\(e-f)+{}\\(g-h). \end{array} $$
I would appreciate more information about this notation if at all possible. How widespread and recognised it is, where it comes from, whether it apply to other infix operators like $×$ etc.