| Subject |
|---|
| Operating resources [1] |
| optical data medium [1] |
| optical soundtrack recording [1] |
| optické nosiče [1] |
| optický záznam [1] |
| orientační běh [1] |
| orientation [2] |
| orienteeing shoes [1] |
| orienteering [1] |
| orientovatelnost [1] |
| origami [1] |
| orizuru [1] |
| ornament [1] |
| osobní prodej [1] |
| ostré linie [1] |
| osvětlení [5] |
| osvětlovací technika [1] |
| outdoor museum [1] |
| outplanting [1] |
| overlarge shapes [1] |