Letter Series Completion FAQ AQF

Observe the cyclic rotation of letters in each step:

• 1st term: FAQ
• 2nd term: AQF (shift first letter F to the end $\implies$ AQF)
• 3rd term: QFA (shift first letter A to the end $\implies$ QFA)
• 4th term: FAQ (shift first letter Q to the end $\implies$ FAQ)

Hence, the missing term is QFA.