Tag Latin Small Letter X (U+E0078) is a Unicode tag character from the Tags block used to encode metadata-like strings inside emoji tag sequences. It is default ignorable and normally invisible, so it does not display by itself nor act as a standalone emoji. In emoji systems, tag characters appear after a base emoji and are terminated by CANCEL TAG (U+E007F) to form a single, specialized glyph when supported. The best-known supported use of tag sequences is for certain subdivision flags built on the WAVING BLACK FLAG (U+1F3F4), such as the flags for England, Scotland, and Wales.
On Apple/iOS and most platforms, typing U+E0078 alone produces no visible symbol, and using it in an unsupported sequence simply leaves the base emoji unchanged. When a recognized tag sequence is formed, the entire run is rendered as a single emoji (for example, a subdivision flag), and the individual tag letters remain invisible. While the letter “x” is not part of the widely supported GB subdivision flag codes, it can appear in non-RGI or private tag sequences, which typically render as the base emoji only. Fonts rarely show a tofu box for this character; instead, it is treated as a zero-width, control-like component.
Developers should remember that emoji tag sequences must end with CANCEL TAG (U+E007F) to be interpreted, and that these tag letters are case-specific small letters in the Tags block. Because it is default ignorable, U+E0078 can be stripped by systems that remove non-essential characters, which may break intended sequences. In text processing, it contributes to the emoji grapheme cluster only when a platform recognizes the overall tag sequence.
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