半はん角かく英えい数すう字じ

noun

half-width alphanumeric characters

Refers to single-byte letters and digits used in computing contexts, as opposed to full-width (全角) characters.

• パスワードは半はん角かく英えい数すう字じで入にゅう力りょくしてください。

  Please enter your password using half-width alphanumeric characters.