 |
| |||
| apito de boca | |||
| buzina | |||
| whistle: 18 phrases in 11 subjects |
| Communications | 5 |
| Cultural studies | 1 |
| Electronics | 2 |
| Environment | 1 |
| General | 3 |
| Materials science | 1 |
| Medical | 1 |
| Natural resourses and wildlife conservation | 1 |
| Natural sciences | 1 |
| Rail transport | 1 |
| Transport | 1 |