名词
中文翻译：字母字符
同义词：
['alphanumeric character', 'alphanumeric character set']
例句：
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1. The alphanumeric character is used to represent letters and numbers in a computer system.
字母字符用于表示计算机系统中的字母和数字。
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2. In the alphanumeric character set, each letter has its own unique code.
在字母字符集中，每个字母都有其独特的代码。
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3. The alphanumeric character set is crucial for data security and privacy protection.
字母字符集对于数据安全和隐私保护至关重要。