Variation Selector-104

Nothing by itself. A variation selector is an invisible, zero-width character that asks for a different glyph form of the character immediately before it.

The requested form depends on that exact base-plus-selector pair; 104 is not a universal style level.

The Unicode Ideographic Variation Database (IVD) lists no E0157 pairing as of 2026-08-03, so this character has no registered ideographic variant to request.

Use it only in a registered sequence

Ideographic variation sequences let a selector after a Han character request a documented written form. This helps publishing, scholarship, and government text preserve a needed glyph shape without encoding every small glyph difference as a separate character.

A Unicode design proposal dated 2000-08-15 describes variation selectors as zero-width and invisible. Here, 104 is an identifier in a technical system, not a meaning.

Why did someone send me this blank-looking character?

It is technical residue, not a standalone message.

If you see nothing, that is expected: the selector has no visible shape. It only has an effect immediately after its defined base, and a supporting font must contain the requested glyph; otherwise the base appears in its default form.

In October 2025, reports on GlassWorm malware documented long runs of supplementary variation selectors used to conceal executable code in VS Code extensions. That is a security abuse of invisible text, not a meaning of this character.