As correctly stated by @MichaelSeifert, it is a graphic representation of a coin
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A circle alone wouldn’t be easily interpreted as currency. I speculate that using the dollar symbol would be biasing in an international context, so using a digit is the most intuitive way to display that the circle has value.
Historically, on US tollways you often used a single coin to pay the toll. Modern tollways are either more expensive or simply electronic (i.e. in Israel you don’t have a single toll booth, and just I found the same "1 coin" icon as I expected on my way from Tel Aviv to Haifa).
Credit:stackoverflow.com‘
5 Mar, 2024
5 Mar, 2024
5 Mar, 2024