Variation Selector-16 表情符号的含义
An invisible codepoint which specifies that the preceding character should be displayed with emoji presentation. Only required if the preceding character defaults to text presentation.
Often used in Emoji ZWJ Sequences, where one or more characters in the sequence have text and emoji presentation, but otherwise default to text (black and white) display.
Variation Selector-16 在 2002 被批准为 统一码3.2 的一部分，并在 2018 被添加到 Emoji 11.0 中.
