Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.

非结构化补充服务数据 [1] （英語： Unstructured Supplementary Service Data ，缩写USSD）有时也称快速码（Quick Codes）或功能码（Feature codes），或译非结构化数据业务 [2] 、非结构化补充数据业务 [2] [3] 、非结构化补充业务数据 [4] 等，是GSM 移动电话与移动网络运营商的 ...

USSD is a world class organization of dam industry professionals who advance the environmentally sustainable science of planning, design, construction, operation and maintenance of dams, levees and associated civil engineering projects.

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United Studios of Self Defense is very proud of our distinctive and dynamic logo. Over the years, many people have asked what the logo represents. To accurately describe our logo’s intricate meaning, the logo must be broken down into its many components. The core of the United Studios of Self Defense logo is the Bonsai Tree.

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2025年3月1日 · At USSD, we provide personalized karate lessons to students of all ages and abilities. Whatever your training goals, we believe in the power of karate to transform your mind, body, and spirit.