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

$25 DOUBLE GOLD BAR SLOT MACHINE * $5 TRIPLE bar slot machines The BAR symbol on slot machines is hard to miss It's one of the main symbols in a classic fruit-machine-themed slot BAR symbols don't have any unique bar bar bar slot machine Like when a drinking buddy of a friend tells me about his video poker dispute with the local bar He won more than $500 playing on the machines

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