Variation Selector-220

Its visible effect belongs to the preceding character, not to this mark alone. The standard rule for variation sequences is simple: the base comes first and this selector follows it. The Unicode Standard §23.4 gives VS220 no independent visual instruction; its number is not a universal style setting, and its effect depends on the complete pair.

The idea came before this individual code point: Unicode first had a small set of variation selectors, then expanded the mechanism into a supplementary range for ideographic variants. Its original job was to preserve a meaningful glyph choice in plain text when choosing a font or using rich-text styling was not enough. The same mechanism later gained separate standardized and emoji sequence lists, but VS220 remains a supplementary selector whose effect depends on its base.

Why does it look empty or do nothing?

That is expected when no supported sequence is present. Under Unicode Standard §23.4, variation selectors are default-ignorable: an unsupported pair should hide the selector and leave the base looking normal. A font and shaping system must support the exact pair before the requested glyph can appear.

VS220's number does not label a Japanese, Chinese, or emoji style. It is one member of the supplementary selector range, and the base character determines what a registered pair means. That is why a selector can be related to ideographic typography without carrying a meaning when sent alone.

How should I use it?

Put it immediately after a base character in a documented sequence. For an exact technical use, start with the complete sequence your font or text system documents; use the palette to get this selector, then attach it to the intended base. An arbitrary base may leave the selector ignored.

Do not treat the selector number as a recipe for a font style. If your goal is a specific ideographic form, use the registered sequence and supporting font identified by the text system that needs it.