| Subject | English | Estonian |
| ed. | knowledge triangle | teadmiste kolmnurk |
| comp., MS | project triangle | projekti kolmnurk (The interrelationship of time, money, and scope. If you adjust any one of these elements, the other two are affected. For example, if you adjust the project plan to shorten the schedule, you might increase costs and decrease scope) |
| ed. | triangle of knowledge | teadmiste kolmnurk |
| comp., MS | triangle strip | kolmnurgatriip (A sequence of triangles in which adjacent triangles share an edge. The first three vertices define the first triangle, and each subsequent vertex defines a new triangle using that point along with two vertices from the previous triangle in the sequence) |
| math. | triangle test | kolmnurgatest |
| gen. | Weimar Triangle | Weimari kolmnurk |
| gen. | Weimar Triangle | Weimari kolmik |