What is the extension attached to the boom point that provides added boom length for lifting specified loads called?

The extension attached to the boom point that provides added boom length for lifting specified loads is called a "boom extension" or "jib." This accessory allows for increased reach and height, enabling the crane to lift loads that are farther away or higher than the standard boom can accommodate. Jibs can be fixed or adjustable, depending on the crane's design and the specific lifting requirements.