What is the meaning of ?

soot (fine particles of amorphous carbon and tar)

sooted dirt or dust accumulated in ceilings, walls, etc.

Short for 煤色 (susuiro): a shade of black as in the color of soot

soot (fine particles of amorphous carbon and tar)

soot (fine particles of amorphous carbon and tar)

soot (fine particles of amorphous carbon and tar)

Source: wiktionary.org