特殊用法acyclic digraph1.非循环双图形, 无圈有向图consonantal digraph1.二辅音字母组(表示一个音, 如英语sh)contrafunctional digraph1.反函数的双图, 逆函数有向图cospectral digraph1.余谱双图, 同谱有向图disconnected digraph1.不连通的二图形functional digraph1.函数图形, 函数双图形, 函数有向图labeled transitive digraph1.标定可迁有向图line digraph1.线有向图primitive digraph1.基本双图, 本原有向图self-complement digraph1.自补有向图self-converse digraph1.自逆的有向图strictly unilateral digraph1.严格单侧有向图strictly weak digraph1.严格弱有向图strong digraph1.强双图symmetric digraph1.对称有向图transitive digraph1.可迁有向图trivial digraph1.平凡双图, 平凡有向图unilateral connected digraph1.单侧连通有向图weak digraph1.弱双图, 弱有向图