Not a standard Chinese character — it is the Japanese shinjitai form of 黑, differing only by one stroke in the upper element. Chinese always writes 黑; you meet 黒 only in Japanese text.
register
Foreign-variant glyph; appears in cross-language and font notes, never in written Chinese.
The upper block depicts a vent caked with soot — the origin of 'black'. In this Japanese variant it takes a 里-like shape instead of the Chinese 黑 top, the only real difference between the two forms.
