Plane

Encoding & Standards

Một nhóm gồm 65,536 điểm mã Unicode liên tiếp. Plane 0 là Basic Multilingual Plane (BMP); hầu hết emoji nằm ở Plane 1 (SMP).

Unicode divides its 1,114,112 code points into 17 planes of 65,536 code points each (Planes 0 through 16). The first plane, Plane 0 (U+0000 to U+FFFF), is the Basic Multilingual Plane (BMP) containing most common scripts.

Plane 1 (U+10000 to U+1FFFF) is the Supplementary Multilingual Plane (SMP), where most emoji are allocated. Planes 2 and beyond contain supplementary CJK characters and reserved space.

The BMP/SMP distinction matters because characters in the BMP can be represented with a single UTF-16 code unit, while SMP characters (including emoji) require surrogate pairs.

Thuật ngữ liên quan

Điểm mã Điểm mã
Giá trị số duy nhất được gán cho mỗi ký tự trong tiêu chuẩn Unicode, được viết theo định dạng U+XXXX (ví dụ: U+1F600 cho 😀). Supplementary Multilingual Plane (SMP) Supplementary Multilingual Plane (SMP)
Unicode Plane 1 (U+10000 đến U+1FFFF), nơi phần lớn các điểm mã emoji được phân bổ. Surrogate Pair Surrogate Pair
Hai đơn vị mã UTF-16 (một surrogate cao U+D800-U+DBFF theo sau là một surrogate thấp U+DC00-U+DFFF) cùng nhau đại diện cho một ký tự trên U+FFFF.

Công cụ liên quan

🔢 Tra cứu Unicode Tra cứu Unicode
Nhập codepoint như U+1F600 để nhận emoji, chi tiết mã hóa, byte UTF-8/16 và HTML entity.

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