Ƀ — Universal Bitcoin Logo Alternative
That is Unicode U+0243 "Latin Capital Letter B with stroke". It is in the Latin Extended-B block, which contains among other mysteries, about half of the latin letters with strokes.I'd love to see a "Unicode: What where they thinking?" page that documents why they thought a particular codepoint should be in the standard. I mean, capital A, B, and C with a stroke, but not capital D? A and C have their stroke diagonal, B has its horizontal, U also gets a horizontal stroke, but it is named a "bar". All very mysterious.