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It’s just the shape of the hour hand as seen on any number of Rolexes. The circle section has three bars like a Mercedes-Benz badge. The bars are there so that the area of lume isn’t too big/fragile, at least, that was the reason originally.
(If you’re talking about the original MB badge, the three lines are meant to point to the air, land and sea, the three types of engine they made.)
https://www.bobswatches.com/rolex-blog/just-because/rolex-mercedes-hands.html
And btw what does the Merc star mean?
See it all over the place, but it never made much sense to me.