Nearly five years ago I proposed for our community to use
COMBINING DOUBLE VERTICAL STROKE OVERLAY (U+20E6).

Here it is in FreeMono (U+0042 and U+20E6).


As you can see, this option has some significant problems:

• you need some typeface that supports Unicode 6.0;
• anyway, it almost never displayed in a suitable form.

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So I will be really happy when this new symbol will appear.

Ken Shirriff, thank you!