Re: IBM 1620 invalid character symbol

[William_J_G Overington via Unicode]

A digit with a bar over the top is used to express the common logarithm of a 
number that is both greater than zero and also less than one.
https://en.wikipedia.org/wiki/Common_logarithm
William Overington
Tuesday 26 September 2017
----Original message----
>From : unicode@unicode.org
Date : 2017/09/26 - 14:34 (GMTST)
To : due...@it.aoyama.ac.jp
Cc : unicode@unicode.org, john.w.kenn...@gmail.com, l...@mailcom.com
Subject : Re: IBM 1620 invalid character symbol
But what is interesting is the use of negative digits (-1 to -9, with the minus 
sign above the digit; I've not seen a case of minus 0, not needed apparently by 
the described operations)
How do you encode these negative decimal digits in Unicode ? with a macron 
diacritic ?
2017-09-26 15:20 GMT+02:00 Martin J. Dürst via Unicode <unicode@unicode.org>:
On 2017/09/26 22:03, John W Kennedy via Unicode wrote:
I don’t know what your snippet is from, but the normally authoritative IBM 
manual, A26-5706-3, IBM 1620 CPU Model 1 (July, 1965) displays what is clearly 
the Cyrillic letter. Whether it should be regarded as that, or as a distinct 
character, is another question. See 
http://www.bitsavers.org/pdf/ibm/1620/A26-5706-3_IBM_1620_CPU_Model_1_Jul65.pdf
What page?
Regards,   Martin.