1] double circle: inner circle being 2 open arcs;
2] above: with slotted inner circle;
3] above: inner being 2 closed arcs aka Italian or Guller cancel known from Italy, Peru and Spain;
4] above: with ⅔rds inner circle with upper crossbar used Germany;
5] above: closed bridge being closed arcs top/bottom within inner circle;
6] above: open bridge aka Swiss or Austrian cancel being 2 arcs with 2 crossbars in centre;
7] box cancel;
8] scallop cancel: mainly used in France.