| Subject | English | Welsh |
| comp., MS | alias (The portion of the e-mail address that appears to the left of the | enw arall |
| comp., MS | e-mail alias (The portion of the e-mail address that appears to the left of the | e-bost arall |
| comp., MS | left align | alinio i'r chwith (To align text along the left margin) |
| comp., MS | left-aligned | wedi'i alinio i'r chwith (Pertaining to text that is aligned along the left margin) |
| comp., MS | left angle bracket | bachyn ongl chwith (The < character) |
| comp., MS | left angle bracket (The | bachyn ongl chwith |
| comp., MS | left arrow | saeth chwith (The key on the keyboard that is labeled with a left arrow) |
| comp., MS | left brace | brês chwith (The { character) |
| comp., MS | left bracket | bachyn chwith (The [ character) |
| comp., MS | left mouse button | botwm chwith llygoden (The button on your pointing device that you use most often for clicking and double-clicking) |
| comp., MS | left-to-right | chwith i'r dde (Pertaining to keyboard settings, document views, user interface objects, and languages for which text is displayed in a left-to-right direction. English and most other European languages are left-to-right languages) |
| comp., MS | right-to-left | de-i-chwith (Pertaining to keyboard settings, document views, user interface objects, languages, etc. for which text is displayed in a right-to-left direction) |
| comp., MS | Video Left | Fideo Chwith (A credit animation in Windows Movie Maker) |
