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Re: Display of undisplayable characters: \U01F3A8 instead of diamond

From: Yuri Khan
Subject: Re: Display of undisplayable characters: \U01F3A8 instead of diamond
Date: Fri, 26 Aug 2022 16:05:07 +0700

On Fri, 26 Aug 2022 at 15:24, Emanuel Berg <incal@dataswamp.org> wrote:

> As for what char it was, it looked like these two - and they
> look the same in a Linux VT -
> \u2666 ♦        BLACK DIAMOND SUIT

Linux console works over (an emulation of?) the VGA text mode, which
descends from IBM CGA text mode, whose set of displayable characters
was defined by code page 437. Its codes 0x03 through 0x06 encoded
playing card suits — hearts, diamonds, clubs, spades, in this order.
In Unicode, these became U+2665, U+2666, U+2663, U+2660, respectively.

I do not know the history of replacing an undisplayable character with
a diamond. The U+FFFD Replacement Character glyph looks similar, but
the cause/consequence link might be in either direction.

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