The combination “iu” is rare at the beginning of words in the English language. Its presence is primarily found in words borrowed from other languages, often Latin or Greek roots, frequently related to scientific or technical terminology.
This infrequent initial letter combination contributes to the precision of technical vocabulary by creating distinct, easily recognizable terms for specific concepts. Historically, the adoption and preservation of these spellings reflect the enduring influence of classical languages on scientific nomenclature. This specialized usage ensures clarity and minimizes ambiguity within these fields.