| T |
Technology–General. |
| TA |
Engineering, general & civil. |
| TC |
Hydraulic engineering. |
| TD |
Environmental technology. Sanitation technology. |
| TE |
Highway engineering. |
| TF |
Railroad engineering. |
| TG |
Bridge construction. |
| TH |
Building construction. |
| TJ |
Mechanical engineering and machinery. |
| TK |
Electrical engineering. Electronics. Nuclear engineering. |
| TL |
Motor vehicles. Aeronautics. Astronautics. |
| TN |
Mining engineering. Metallurgy. |
| TP |
Chemical technology. |
| TR |
Photography. |
| TS |
Manufacturing sciences. |
| TT |
Handicrafts. Arts and crafts. |
| TX |
Home economics. |
