Variation Selectors Supplement

Block from U+E0100 to U+E01EF. This block was introduced in Unicode version 4.0 (2003). It contains 240 codepoints.

The Wikipedia provides the following information on block Variation Selectors Supplement:

Variation Selectors Supplement is a Unicode block containing 240 Variation Selector format characters (designated as VS17 through VS256). They are used to specify a specific glyph variant for a unicode character. They are only used with CJK Unified ideographs to specify a variant glyph form registered in the Ideographic Variation Database, and currently only variation sequences using VS17 through VS48 have been registered.

Chart at Unicode.org (PDF)
Block at Decode Unicode