| Subject | English | German |
| gen. | decomposition into triangular matrices | Dreieckszerlegung |
| el. | triangular matrix | Dreieckskoppeleinrichtung |
| el. | triangular matrix | Faltgruppierung |
| el. | triangular matrix | Dreieckskoppelfeld |
| el. | triangular matrix | gefaltete Koppeleinrichtung |
| gen. | triangular matrix | Dreiecksmatrix |
