Reserved Notation "a ++ b" (at level 60, right associativity).
Reserved Notation "f ○ g" (at level 100).
Reserved Notation "f >>>> g" (at level 45).
+Reserved Notation "a >>⊗>> b" (at level 20).
Reserved Notation "f **** g" (at level 40).
Reserved Notation "C × D" (at level 40).
Reserved Notation "C ×× D" (at level 45).