All of these characters are intended for compatibility with character cell graphic sets in use prior to 1990.
Block elements
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Shade characters
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Terminal graphic characters
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.
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Media in category "Unicode 2580-259F Block Elements"