IBM 1620 invalid character symbol

[Leo Broukhis via Unicode]

Wikipedia (https://en.wikipedia.org/wiki/IBM_1620#Invalid_character)
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

2BFF 1 HELLSCHREIBER PAUSE SYMBOL

in the pipeline, although I learned about both earlier today within a few
minutes of one another.

Thanks,
Leo
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