未限定

缺少必要变体选择符、可能无法在所有平台上正常渲染为表情符号的序列。

An unqualified emoji is missing a *required* VS-16 character. Without it, the character may render as a plain text symbol rather than a colorful emoji glyph on some platforms.

Characters like ♥ (U+2764), ☺ (U+263A), and ✈ (U+2708) are common examples — they originated as text symbols and need VS-16 to reliably trigger emoji presentation. Without it, rendering depends on platform defaults.

When building applications that work with emoji, always normalize to fully qualified forms for storage and comparison.