When the pitch descends, the contour is called a falling tone; when it ascends, a rising tone; when it descends and then returns, a dipping or falling-rising tone; and when it ascends and then returns, it is called a peaking or rising-falling tone.
Lexical tones more complex than dipping (falling-rising) or peaking (rising-falling) are quite rare, perhaps nonexistent, though prosody may produce such effects.