Q

Q (named cue /ˈkjuː/) is the 17th letter of the modern English alphabet and the ISO basic Latin alphabet. In nearly all languages using the Latin alphabet it is a consonant, not a vowel.

The Semitic sound value of Qôp was /q/ (voiceless uvular stop), and the form of the letter could have been based on the eye of a needle, a knot, or even a monkey with its tail hanging down./q/ is a sound common to Semitic languages, but not found in many European languages. Some have even suggested that the form of the letter Q is even more ancient: it could have originated from Egyptian hieroglyphics.

In Greek, qoppa (Ϙ) probably came to represent several labialized velar stops, among them /kʷ/ and /kʷʰ/. As a result of later sound shifts, these sounds in Greek changed to /p/ and /pʰ/ respectively. Therefore, qoppa was transformed into two letters: qoppa, which stood for the number 90, and phi (Φ), which stood for the aspirated sound /pʰ/ that came to be pronounced /f/ in Modern Greek.

...
Wikipedia