Hangul (obsolete Unicode block)

Hangul, Hangul Supplementary-A, and Hangul Supplementary-B were character blocks that existed in Unicode 1.0 and 1.1, and ISO/IEC 10646-1:1993. These blocks encoded precomposed modern Hangul syllables. These three Unicode 1.x blocks were deleted and superseded by the new Hangul Syllables block (U+AC00–U+D7AF) in Unicode 2.0 (July 1996) and ISO/IEC 10646-1:1993 Amd. 5 (1998), and are now occupied by CJK Unified Ideographs Extension A and Yijing Hexagram Symbols. Moving or removing existing characters has been prohibited by the Unicode Stability Policy for all versions following Unicode 2.0, so the Hangul Syllables block introduced in Unicode 2.0 is immutable.

Documentation
The Unicode 1.0.0 code chart is still available online, including the Korean Hangul Syllables block, but not the supplements added in Unicode 1.1. Full code charts for Unicode 1.1 were "never created", since Unicode 1.1 was published only as a report amending Unicode 1.0 due to the urgency of releasing it; however, full code charts for ISO/IEC 10646-1:1993 were available, covering all three blocks.

Data for mapping between Unicode 1.1, Unicode 2.0 and other hangul encodings has been supplied by the Unicode Consortium. This data is archived as historic, but contains errors; an errata document is also supplied which corrects the mappings with reference to decompositions from the Unicode Character Database for Unicode 1.1.5, which is itself also available. However, the Unicode 1.1.5 data itself contains some errors; corrected data with reference to the ISO/IEC 10646-1:1993 code charts and the source standards is documented in the Unicode Technical Committee document UTC L2/17-080.
 * U+384E: 삤 in the Unicode Character Database for Unicode 1.1.5, but 삣 in the Unicode 1.0 and ISO/IEC 10646-1:1993 code charts and per the source standard mappings
 * U+40BC: 삣 in the Unicode Character Database for Unicode 1.1.5, but 삤 in the ISO/IEC 10646-1:1993 code charts and per the source standard mappings
 * U+436C: 콫 in the Unicode Character Database for Unicode 1.1.5, but 콪 in the ISO/IEC 10646-1:1993 code charts and per the source standard mappings

Korean Hangul Syllables block
Hangul (U+3400–U+3D2D), also called Korean Hangul Syllables, consisted of 2,350 syllables from KS C 5601-1987 (now KS X 1001). This block was encoded from Unicode 1.0.0 and included in the main code chart (without character names) but not in the block charts (which included character names).

Hangul Supplementary-A block
Hangul Supplementary-A (U+3D2E–U+44B7) consisted of 1,930 syllables from KS C 5657-1991 (now KS X 1002).

Hangul Supplementary-B block
Hangul Supplementary-B (U+44B8–U+4DFF) consisted of six syllables from GB 12052-89 (U+44B8–U+44BD) and the first 2,370 syllables that are not in the aforementioned three sets (U+44BE–U+4DFF).