| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | overhead projector | Germany | Commonly used in classrooms and meetings for presenting material | 1 |
| 2 | projector | Germany | Commonly used in business meetings and educational institutions | 1 |
| 3 | slide projector | Germany | Commonly used in schools and business presentations before digital projectors became widespread | 1 |