^In IBM's system of character IDs, this is SV240000, not the SF150000 which is mapped to U+2592▒ in other code pages such as code page 437. The reference glyph for SV240000 differs in showing a chequerboard pattern rather than SF150000's dithered shade.U+1FB95🮕 , in the much more recently added Symbols for Legacy Computing block, is explicitly a chequerboard shade. In the specification for IBM Japanese Host code, SV240080 (i.e. SV240000 with the fullwidth attribute set) is mapped to U+25A6▦ ; however, the reference glyph given there for SV240080 differs from that of SV240000.
^The Unicode code chart for the range U+23BA through U+23BD (the scan lines before and after this character) explicitly notes that "scan line-5 is unified with the box-drawing graphic character 2500".