Looking at the document
http://www.unicode.org/L2/L1999/99159.pdf
that has been mentioned, the four bracket characters are therein described as
follows.
4X1F O LEFT BRACKET, REVERSE SOLIDUS TOP CORNER
4X20 C RIGHT BRACKET, REVERSE SOLIDUS BOTTOM CORNER
4X21 O LEFT BRACKET, SOLIDUS BOTTOM CORNER
4X22 C RIGHT BRACKET, SOLIDUS TOP CORNER
So it looks like the pairings in Unicode today are as originally intended.
May I suggest a (possibly new) use for the brackets please?
When a person is transcribing a document into a computer, perhaps a historical
document, the first pair could be used to indicate a transcriber's note that
the text between the brackets was crossed out in the original document, and the
second pair could be used to indicate a transcriber's note that the text
between the brackets was crossed out in the original document yet had been
reinstated in the original document, either by the word stet being placed next
to the crossed-out text or otherwise.
William Overington
24 August 2015
