IBM 1620 invalid character symbol

John W Kennedy via Unicode unicode at
Tue Sep 26 08:03:00 CDT 2017

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

> 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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