Invisible variation selector number 255, a zero-width mark that picks a specific glyph variant of the preceding character, mainly for CJK text.
U+E01EDVARIATION SELECTOR-254U+E01EFVARIATION SELECTOR-256U+E01ECVARIATION SELECTOR-253U+E01EBVARIATION SELECTOR-252U+E01EAVARIATION SELECTOR-251U+E01E9VARIATION SELECTOR-250U+E01E8VARIATION SELECTOR-249U+E01E7VARIATION SELECTOR-248U+E01E6VARIATION SELECTOR-247U+E01E5VARIATION SELECTOR-246U+E01E4VARIATION SELECTOR-245U+E01E3VARIATION SELECTOR-244240 characters in the Variation Selectors Supplement Unicode block, from number 239.