The word "clx" is actually a Roman numeral, which represents the number 160 in modern Arabic numerals. In IPA phonetic transcription, "clx" is written as /kliks/, with a voiced velar stop /k/ followed by a voiced alveolar lateral fricative /l/ and a voiceless alveolar fricative /s/. The spelling of "clx" reflects the Roman system of representing numbers with letters, with "c" standing for 100, "l" for 50, and "x" for 10. Despite its archaic appearance, the use of Roman numerals persists in some contexts, such as clock faces and film credits.