Block Elements
Block from U+2580 to U+259F. This block was introduced in Unicode version 1.1 (1993). It contains 32 codepoints.
The Wikipedia provides the following information on block Block Elements:
Block Elements is a Unicode block containing square block symbols of various fill and shading. Used along with block elements are boxdrawing characters, shade characters, and terminal graphic characters. These can be used for filling regions of the screen and portraying drop shadows. Its block name in Unicode 1.0 was Blocks.
Chart at Unicode.org (PDF)
Block at Decode Unicode

Upper Half BlockGlyph for U+2580 
Lower One Eighth BlockGlyph for U+2581 
Lower One Quarter BlockGlyph for U+2582 
Lower Three Eighths BlockGlyph for U+2583 
Lower Half BlockGlyph for U+2584 
Lower Five Eighths BlockGlyph for U+2585 
Lower Three Quarters BlockGlyph for U+2586 
Lower Seven Eighths BlockGlyph for U+2587 
Full BlockGlyph for U+2588 
Left Seven Eighths BlockGlyph for U+2589 
Left Three Quarters BlockGlyph for U+258A 
Left Five Eighths BlockGlyph for U+258B 
Left Half BlockGlyph for U+258C 
Left Three Eighths BlockGlyph for U+258D 
Left One Quarter BlockGlyph for U+258E 
Left One Eighth BlockGlyph for U+258F 
Right Half BlockGlyph for U+2590 
Light ShadeGlyph for U+2591 
Medium ShadeGlyph for U+2592 
Dark ShadeGlyph for U+2593 
Upper One Eighth BlockGlyph for U+2594 
Right One Eighth BlockGlyph for U+2595 
Quadrant Lower LeftGlyph for U+2596 
Quadrant Lower RightGlyph for U+2597 
Quadrant Upper LeftGlyph for U+2598 
Quadrant Upper Left and Lower Left and Lower RightGlyph for U+2599 
Quadrant Upper Left and Lower RightGlyph for U+259A 
Quadrant Upper Left and Upper Right and Lower LeftGlyph for U+259B 
Quadrant Upper Left and Upper Right and Lower RightGlyph for U+259C 
Quadrant Upper RightGlyph for U+259D 
Quadrant Upper Right and Lower LeftGlyph for U+259E 
Quadrant Upper Right and Lower Left and Lower RightGlyph for U+259F