Vladimir Filippov added the comment:
According to
ftp://ftp.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/EBCDIC/CP037.TXT symbols [
and ] have other codes (instead of 0xAD and 0xBD):
0xBA0x005B #LEFT SQUARE BRACKET
0xBB0x005D #RIGHT SQUARE BRACKET
Looks like
ftp://ftp.unicode.org
New submission from Vladimir Filippov:
These 4 symbols were encoded incorrectly to EBCDIC (codec cp500): "![]|".
Correct table of conversation for these symbols described in
https://www.ibm.com/support/knowledgecenter/SSZJPZ_11.3.0/com.ibm.swg.im.iis.ds.parjob.adref.