IBM 1620 invalid character symbol

Philippe Verdy via Unicode unicode at
Tue Sep 26 08:28:37 CDT 2017

This is what is printed in the manual by its editor that probably used
metalic fonts, however I doubt the actual typewriter had this symbol on the
wheel of hammers, and it was probably just overtriking the two letters X
and I.

2017-09-26 15:03 GMT+02:00 John W Kennedy via Unicode <unicode at>:

> 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
> pdf/ibm/1620/A26-5706-3_IBM_1620_CPU_Model_1_Jul65.pdf
> On Sep 26, 2017, at 12:48 AM, Leo Broukhis via Unicode <
> unicode at> wrote:
> Wikipedia (
> describes the "invalid character" symbol (see attachment) as a Cyrillic Ж
> which it obviously is not.
> But what is it? Does it deserve encoding, or is it a glyph variation of an
> existing codepoint?
> The question is somewhat prompted by
> in the pipeline, although I learned about both earlier today within a few
> minutes of one another.
> Thanks,
> Leo
> <invalid.jpeg>
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