| Subject | English | Russian |
| Игорь Миг | according to one's unwritten rules | по понятиям (M. Berdy, TMT (2009) || Фирма подписывает договор по закону, а платит по понятиям = >> The company signs a contract according to the law but pays according to its own unwritten rules) |
| gen. | unwritten rule | неписаное правило (I didn't know it then, but I'd broken one of the biggest unwritten rules. Rust71) |
| gen. | unwritten rule | неписаный закон (Rust71) |
| mil., obs. | unwritten rules | неписаные правила (признанные в силу обычая) |