The term “quartant” used in names of these 10 characters refers to block mosaics divided into four parts. The 6 related characters are the upper half block (U+2580), the lower half block (U+2588), the full block (U+2588), the left half block (U+258C), the right half block (U+2590) in “Blocks elements”, and the no-break-space (U+00A0) or the ideographic space.