The doc designate those characters as negative digits. They are used during numeric processing as well and then refered to as "-1".. "-9" and explcitly says it is a negative sign
2017-09-26 17:53 GMT+02:00 Ken Whistler <[email protected]>: > Philippe, > > Those aren't negative digits, per se. The usage in the manual is with an > overline (or macron) to indicate the flag bit. It does occur over a zero, > and in explanation in the text of floating point operations, it is also > shown over letters (X, M, E) representing digits of the exponent and > mantissa. See p. 27 (31 of the pdf) in that same manual, for an extensive > discussion with lots of examples in the text: > > http://www.bitsavers.org/pdf/ibm/1620/A26-5706-3_IBM_1620_ > CPU_Model_1_Jul65.pdf > > The Unicode representation of the text material printed on that page would > best be done with a combining macron, I think. > > --Ken > > On 9/26/2017 6:34 AM, Philippe Verdy via Unicode wrote: > > 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 ? > > >
