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| English | Lao |
| backward compatibility | ຄວາມສາມາດເຂົ້າກັນໄດ້ລະຫວ່າງເກົ່າແລະໃໝ່ (The capability of source code or programs developed on a more advanced system or compiler version to be executed or compiled by a less advanced (older) version) |
| backward slash | ເຄື່ອງໝາຍທັບຂວາ (A character used to separate directory names in MS-DOS and UNIX path specifications. When used as a leading character, it means that the path specification begins from the topmost level for that disk drive) |