Keycap Sequence
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Một chuỗi emoji được tạo thành từ chữ số hoặc ký hiệu, theo sau là VS-16 (U+FE0F) và ký tự keycap bao quanh (U+20E3).
Keycap emoji represent keys on a telephone or keyboard. They are formed from three characters: a base character (0-9, *, or #), VS-16 to request emoji presentation, and U+20E3 (combining enclosing keycap) to add the visual key border.For example, 2️⃣ is: `2` (U+0032) + `VS-16` (U+FE0F) + `⃣` (U+20E3). There are 12 keycap sequences in total: digits 0-9, asterisk (*), and hash (#).
These are among the oldest emoji sequences and demonstrate how Unicode combines existing characters with modifiers rather than assigning entirely new code points.