eli5: Why do slot machines have „“ as a symbol?

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First and second symbols different : No reward; Any 2 matching with bell at

Land & Environment slot machine bar symbol 00:45:08  स्लॉट मशीन बार प्रतीक क्या हैं और इसका उपयोग 3251 slot machine icons Vector icons in SVG, PSD, PNG, EPS and ICON FONT

legal 4d slot The Lucky 7s, the cherry and the BAR symbol are instantly recognizable symbols of slot machines, but where did they come from? The BAR symbol is another holdout from classic slot machines that used to dispense sticks of chewing gum This symbol resembles a stack of gum