| Subject | English | Icelandic |
| comp., MS | composite character | samsettur stafur (A text element consisting of a base character and a diacritic or accent mark. Although most common in the Latin script, other scripts (including Greek, Devanagari, and Tamil) also have composite characters) |
| math. | composite estimator | samsettur metilsins |
| math. | composite hypothesis | samsettur tilgátu |
| math. | composite index number | samsett vísitala |
| math. | composite sampling scheme | samsettur sýnatöku fyrirætlun |