1. Connector: A detachable component (excluding an adapter) typically installed on cables or equipment for electrical connections in transmission line systems.

　　2. RF connector: A connector used within the RF range.

　　3. Video: Wireless waves in the frequency range of 3Hz to 30MHz.

　　4. Radio frequency: a radio wave with a frequency range between 3 kHz and 3000 GHz.

　　5. High frequency: a radio wave with a frequency range between 3MHz and 30MHz.

　　6. Coaxial: The inner conductor has a dielectric support and can structurally obtain the minimum internal reflection coefficient within the frequency range used in measurement.

　　7. Triple axis: A transmission line composed of three concentric conductors with a common axis and insulated from each other.

　　8. Level: The level of mechanical and electrical precision of the connector, especially in the specified reflection coefficient.

　　9. Universal connector (Level 2): A type of connector manufactured with the widest allowable dimensional deviation (tolerance), but still able to ensure the minimum specified performance and compatibility

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