Can't say about Mac (I dont have one)
iOS has two different bar-repeat signs.
Single slash (repeat one bar) placed in the 2nd space in a 4-space measure so it appears in the center of the bar.
Double slash (repeat two bars) placed in the 4th space in a 4-space measure so it appears on the line between bars.
What's With You - Mose Allison
)BOB