| Subject | English | Estonian |
| commun., transp., avia. | automatic relay installation | automaatruuter |
| el. | back up protection relay | kaitseseadis |
| el. | back up protection relay | kaitserelee |
| transp., mil., grnd.forc., el. | first stage relay | esimese astme relee |
| commun., transp., avia. | fully-automatic relay installation | täisautomaatruuter |
| comp., MS | Internet Relay Chat | IRC (A service that enables an Internet user to participate in a conversation online in real time with other users) |
| el. | protection relay | kaitserelee |
| el. | protection relay | kaitseseadis |
| el. | protective relay | kaitserelee |
| el. | protective relay | kaitseseadis |
| comp., MS | relay host | vahehost (A designated server through which Exchange routes all outgoing messages. The smart host then makes the remote connection. If a smart host is designated, the Exchange server only needs to transmit to the smart host, instead of repeatedly contacting the domain until a connection is made) |
| comp., MS | relay port | vaheport (A type of class port that defines the internal and external ports of an actor class. Can appear only on the border of an actor class. Relay ports relay incoming messages to a contained actor or outgoing messages from a contained actor) |
| comp., MS | relay server | vaheserver (A server that manages the exchange of messages or information among different users) |
| commun., transp., avia. | semi-automatic relay installation | poolautomaatruuter |
| commun., transp., avia. | torn-tape relay installation | perfolintruuter |