| Subject | English | Bulgarian |
| construct. | triangle misclosure | несключване на триъгълника |
| ed. | triangle of knowledge | триъгълник на знанието |
| comp., MS | triangle strip | лента от триъгълници (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) |
| build.struct. | wooden triangle nailed to stair string | прикована подложка |