What is the meaning of the word "q"?

Definitions:

  1. Abbreviation for 'quarter'; a period of three months in a company's financial year. copy to clipboard ABBREVIATION
    • Apple reports lower than expected Q3 profits. copy to clipboard
  2. Abbreviation for 'question'. copy to clipboard ABBREVIATION
    • Q: What's the problem?. copy to clipboard
  3. The 17th letter of the English alphabet. copy to clipboard NOUN
    • It has the letter 'Q' carved on each side in faded red. copy to clipboard