| Subject | English | Korean |
| math. | Bock's three component model | Bock의 삼인자 모형 |
| math. | cubic designs with three associate classes | 3개동반층 육면체설계 |
| comp., MS | three-dimensional | 3차원 (Of, pertaining to, or being an object or image having or appearing to have all three spatial dimensions (length, width, and depth)) |
| math. | three-dimensional lattice | 3차원 격자 |
| comp., MS | three-factor authentication | 3단계 인증 (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) |
| math. | three-point assay | 삼점 시험 |
| math. | three-series theorem | 삼차 계열 정리 |
| math. | three-stage least squares | 삼단계최소제곱 |
| comp., MS | three-way handshake | 3방향 핸드셰이크 (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) |