Yin Collection, Upper Volume
Radical: Roof (bù)
Ning
Kangxi Strokes: 14
Page 281, Entry 12
Tang Rhymes: Pronounced zhu.
Collected Rhymes and Rhyme Collection: Pronounced zhu.
Literary Approaches to the Classics (Erya): The space between the gate and the screen is called ning.
Book of Rites (Liji): The Son of Heaven stands at the ning.
Commentary: The space inside the gate and outside the screen is where the ruler stands to attend court.
Also, in Collected Rhymes, it is used interchangeably with zhu.
Book of Odes (Shijing): Waiting for me at the ning. Now written as zhu.
Also, in Extensive Rhymes: Pronounced chu. In Collected Rhymes, Rhyme Collection, and Correct Rhymes: Pronounced chu. The meaning is the same.
Also, according to Explaining Graphs (Shuowen): Ning means to arrange piled objects. It depicts the shape of a high center surrounded on all four sides. Note: Piling objects contradicts the original meaning in the Literary Approaches to the Classics (Erya). The Rhyme Collection separates these into the rhyme group u.
Textual Research: According to Explaining Graphs, the original text says to arrange piled objects. I have corrected the character for arrange accordingly.