I prefer using q.t. instead of the full phrase.

They met on the qt to discuss their secret plan.

They are meeting on the Q.T.

They are meeting on the q.t.

The game paused at QT for a short break.

I need to install QT on my computer.

The quack-salver claimed to have a miracle cure for all ailments.

I saw a group of quad bikes racing through the desert.

The quadratic formulas can be used to solve quadratic equations.

I quadruple-clicked the mouse to open the program.