piano - What does this 'Led' or 'Σed' indication mean? - Music

In Mark Levine's The Jazz Theory Book, there is this example to be played on the piano: The Jazz Theory Book, figure 3-149 I've never had any piano training/lessons, so I don't really know the

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theory - Why does the pedal sign look like “Leo”? - Music: Practice & Theory Stack Exchange

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piano - What does this 'Led' or 'Σed' indication mean? - Music: Practice & Theory Stack Exchange

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