What does rhet stand for?

Rhetoric (NTIO)

Resonant Hot Electron Transistor (SAUS)

Resonant Hot-Tunnelling Electron Transistor - Electronics (AAEL)

Resonant-tunneling Hot Electron Transistor (SAUS)

Rhetoric

Rhetorician (SAUS)

Ars Rhetorica - of Dionysius Halicarnassensis - Classical studies (OCD)

De Rhetoribus - of Suetonius - Classical studies (OCD)

Rhetores Graeci - A publication (OCD)