| English | Luxembourgish |
| High Contrast | Héije Kontrast (A feature that heightens the color contrast of some text and images on your computer screen, making those items more distinct and easier to identify) |
| high-definition DVD | High-Definitioun DVD (A high definition optical disc format which uses a smaller focus blue-violet 405 nm laser allowing higher precision and storage density. A competitor to Blu-ray Disc) |
| high-definition multimedia interface | HDMI (A digital interface specification for delivering digital content and connecting consumer electronic devices) |
| high-density multichip interconnect | HDMI (A digital interface specification for delivering digital content and connecting consumer electronic devices) |
| high-low lines | Héich-déif-Linnen (In 2-D line charts, lines that extend from the highest to the lowest value in each category. High-low lines are often used in stock charts) |
