If the white part is the scraper, what do you make of the black border around it?
For me, it is a lighting artifact of light glinting off the scrapper in an odd way.
Optional thoughts.
One idea I had and discarded, the nubs were a kind of built in stand for setting it down without the brushes touching the surface. But having painted a few hundred thousand yards of surface in my life, the last thing I would want is more weight on the brush. Maybe they glued something on? Maybe.
Googling both options nets similar results for both.
Orange is used for both vintage scrapper and paint brush handles, but I could not find vintage brushes with
white bristles. Black, tan or gray only. I could find vintage scrappers with metal blades but not find vintage scrappers with nubs.
At the end of the day, excepting some miracle evidence is entered, I don't think we're going to attain a 100% consensus either way.
I think the black border is either 1. an alteration to the prop to attempt to disguise it or, most likely IMO, 2. a lighting artifact of light glinting off the scrapper in an odd way.
While I could not find a suitable img, I remember using similar scrappers with ice hammers attached a long time ago in Montana in winter so that is why I chose scraper.
Maybe it's a cleaning brush for the consoles. God only knows how much coffee has been spilt when the ship gets tossed around.

And rock dust.