| Subject | English | Croatian |
| comp., MS | three-factor authentication | trostruka provjera autentičnosti (An authentication method that requires three authentication methods, which may include something the user provides, such as certificates; something the user knows, such as user names, passwords, or pass phrases; physical attributes, such as a thumbprint; and personal attributes, such as a personal signature) |
| transp., mech.eng. | three-way catalyser | trosmjerni katalizator |
| transp., mech.eng. | three-way catalytic converter | trosmjerni katalizator |
| comp., MS | three-way handshake | trostruko rukovanje (The method for initializing a Transmission Control Protocol (TCP) session between two hosts on an Internet Protocol (IP) network. The three-way handshake synchronizes the sequence number and acknowledgment numbers of the two hosts establishing a connection, exchanges TCP window sizes, and exchanges other TCP options, such as the maximum segment size) |
| gen. | three-wheel motor vehicle | motorno vozilo na tri kotača |