| Subject | English | Russian |
| media. | angular width of spot | апертура пучка (aperture of the beam, beam width) |
| media. | angular width of spot | ширина луча (aperture of the beam, beam width) |
| media. | angular width of spot | угловая ширина пятна (aperture of the beam, beam width) |
| hi.energ. | angular width of the beam | угловая ширина пучка |