Xu Collection, Middle Volume
Radical: Short-tailed bird (zhuī)
Kangxi Strokes: 10
Page 172, Entry 06
Tang Rhymes (Tangyun), Collected Rhymes (Jiyun), Dictionary of Rhymes (Yunhui), and Correct Rhymes (Zhengyun) all define this as pronounced zhi.
Shuowen Jiezi states it is a bird. It is composed of the radical for hand (you) and the radical for short-tailed bird (zhui). Holding one bird is called zhi; holding two birds is called shuang.
Yupian states it means odd or solitary.
Zengyun states a single item is called zhi.
Book of the Later Han (Hou Hanshu), Biography of Arts and Occultists: Obtained a single shoe.
Biography of Emperor Mu of Zhou (Tianzi Zhuan): Carrying ten thousand pieces of jade.
Also, in the Book of Liezi (Liezi), Chapter on Strength and Fate: Many pairs, self-centered, riding on power, standing alone—these four people traveled through the world together, each according to his own will.