Which instrument shows the yaw and roll of an aircraft around the vertical and longitudinal axes?

The instrument that displays the yaw and roll of an aircraft around the vertical and longitudinal axes is the turn coordinator. This instrument provides vital information about the aircraft's rate of turn and the coordination of that turn, indicating whether the turn is balanced or if it is skidding or slipping. The turn coordinator has a small airplane symbol that represents the aircraft; it moves in relation to a rotating reference that displays the rate of turn in degrees per second.

Additionally, the turn coordinator plays a crucial role in maintaining control during turns, allowing pilots to make adjustments as necessary for safe maneuvers. While the other instruments mentioned serve different purposes—such as showing overall aircraft attitude, heading, or vertical speed—they do not specifically measure yaw and roll as effectively as the turn coordinator does.