| Subject | English | Arabic |
| radio | class B of an amplifying stage | صنف B لمرحلة التضخيم |
| comp., MS | Class B IP address | عنوان IP من فئة B (A unicast IP address that ranges from 128.0.0.1 through 191.255.255.254. The first two octets indicate the network, and the last two octets indicate the host on the network. Class-based IP addressing has been superceded by Classless Interdomain Routing (CIDR)) |
| vac.tub. | class B operation | تشغيل الصمام في الحاله B |