Block from U+FE00 to U+FE0F. This block was introduced in Unicode version 3.2 (2002). It contains 16 codepoints.
The Wikipedia provides the following information on block Variation Selectors:
Variation Selectors is a Unicode block containing 16 Variation Selector format characters (designated VS1 through VS16). They are used to specify a specific glyph variant for a Unicode character. They are currently used to specify standardized variation sequences for mathematical symbols, emoji symbols, 'Phags-pa letters, and CJK unified ideographs corresponding to CJK compatibility ideographs. At present only standardized variation sequences with VS1, VS15 and VS16 have been defined.