| Subject | English | Welsh |
| comp., MS | CAPS LOCK key | bysell CAPS LOCK (A toggle key that, when on, shifts the alphabetic characters on the keyboard to uppercase) |
| comp., MS | lock screen | sgrîn cloi (The screen that appears when a user locks the PC) |
| comp., MS | lock token | tocyn cloi (The value that is returned on successful execution of the WebDAV LOCK method. This value is used to transact subsequent requests) |
| comp., MS | Lock Tracking | Tracio Clo (An option that turns on change tracking and lets you set a password to prevent unauthorized users from turning it off) |
| comp., MS | rotation lock | clo troi (A software setting that disables display rotation) |
| comp., MS | rotation lock button | botwm cloi cylchdro (The button or slider on tablets and convertible tablets that rotates the display) |
| comp., MS | SCROLL LOCK key | bysell SCROLL LOCK (On the IBM PC/XT and AT and compatible keyboards, a key on the top row of the numeric keypad that controls the effect of the cursor control keys and sometimes prevents the screen from scrolling. On the enhanced and Macintosh keyboards, this key is to the right of the function keys on the top row. Many modern applications ignore the Scroll Lock setting) |