Plain English Meaning

A tail design where the small horizontal wing at the back is mounted on top of the upright fin, instead of attached to the fuselage. From behind, the tail looks like the letter T.

Full Definition

An empennage configuration in which the horizontal stabilizer is mounted on top of the vertical stabilizer, forming a shape resembling the letter T when viewed from the front or rear. This arrangement places the horizontal tail surfaces above the wing wake and propeller slipstream during normal flight, but can leave them exposed to disturbed, low-energy air at high .