Xu Collection, Upper Volume
Radical: Gate (mén)
Entry: 閛
Kangxi stroke count: 13
Page 1333, Entry 16
Broad Rhymes (Guangyun): Pronounced peng. Collected Rhymes (Jiyun): Pronounced peng. Rhyme Meetings (Yunhui): Pronounced peng. Correct Rhymes (Zhengyun): Pronounced peng.
Broad Rhymes (Guangyun): The sound of a door leaf. Collected Rhymes (Jiyun): The sound of closing a door leaf.
Yangzi's Exemplary Sayings (Fayan): Open it and it expands to reveal the four seas; close it and it is closed off (peng) so that the inside is not seen. Common usage writes it as an (dark/obscure), which is incorrect.
Also, Collected Rhymes (Jiyun): Pronounced peng. The act of opening or closing a door. Sometimes written in a variant form.