statistics - What does the superscript used in tennis scores mean

In the score below, what do the 7 and 4 superscripts mean in the first set?

Towards multi‐agent reinforcement learning‐driven over‐the‐counter market simulations - Vadori - Mathematical Finance - Wiley Online Library

rules - What does this number mean in PGA Tournament scores? - Sports Stack Exchange

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Tennis Statistics

Tennis Scoring System Explained - Perfect Tennis

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Tennis Scoring System Explained - Perfect Tennis

Tennis superstar Rafael Nadal's first-serve speeds in a rece

Towards multi‐agent reinforcement learning‐driven over‐the‐counter market simulations - Vadori - Mathematical Finance - Wiley Online Library

Enzyme- and gene-specific biases in reverse transcription of RNA raise concerns for evaluating gene expression