Initialism of quality assurance.

• Systematic processes ensuring products or services meet standards.
• The department responsible for preventing defects.

Initialism of question and answer.

• A session or format where questions receive answers.

Initialism of quaternary ammonium.

• A class of nitrogen-containing cations used as disinfectants or surfactants.

A member of Queen Alexandra's Royal Army Nursing Corps.

• British Army nurse serving in that corps.

Initialism of quixotic agitator.

• An impractical, idealistic activist; rare, humorous.