New bopomofo sign used for Black Miao

We are here trying to catalog a set of bible parts in Chinese dialects and minority languages. Some of these use the Pollard script, some the Bopomofo/Zhuyin fuhao, and some the Wang Zhao script.

Trying to enter the titles for Mark and Matthew in Black Miao, that use the Zhuyin fuhao script, I could not find the following character: looks like ±, pronounced (apparently) yi (beginning of 音). See attachment.

I have not looked at the text itself, to see whether there are other unknown signs; I thought it better to ask first, whether anyone has researched Zhuyin fuhao as used for Black Miao. (Both publications date from 1928.) It is not listed in https://zh.wikipedia.org/zh-hant/%E6%B3%A8%E9%9F%B3%E5%AD%97%E6%AF%8D%E8%8B%97%E6%96%87.

Then up to the 4 Wang Zhao titles…

Martin Heijdra, Ph.D. 何義壯
   Director. The East Asian Library and the Gest Collection
   Princeton University Library
   33 Frist Campus Center, Room 317
   Princeton, NJ 08544-1100 USA
   Phone (609) 258-3183
   [email protected]<mailto:[email protected]>