| Subject | French | English |
| hi.energ. | unité de cascade | cascade unit |
| hi.energ. | unité de cascade | radiation unit |
| hi.energ. | unité de cascade | Heitler unit (especially in theory of electron-photon showers) |
| hi.energ. | unité de cascade | radiation length (of а relativistic particle, decrease of initial energy by a factor e) |
| earth.sc. | unité de cascade collective | cascade of cascades |