+4 = 7 

ㄌㄩˇ

  1. 古時竹管用來校正樂音器具其中偶數」。 」。

surname Lü, pitchpipe, pitch standard, one of the twelve semitones in the traditional tone system
(nom de famille)​
Lü (Familienname)​ (Eig, Fam)​