Does it have to be a dropdown?
If the range is not a huge one would it be okay to use a slider to select the items. It would be much better to see the whole context and see where it's been used. If it's located within a small dropdown ofc slider is a terrible choice. If it's on mobile that's much worse lol.
But if you really need to use icons, I would have used something like this.
But there's the other problem with this icon. It's not that it's not explanatory at all. It could be grid view or a IKEA shelf lol.
The thing about functional icons, they're mostly used for simple functions. Like cut, copy, paste, delete, move, pen, rectangle etc. And they need to be recognized immediately when they've seen in a glance. That's why we still use diskette's for save functions (it's been thought back then and that terminology is engraved with that icon)
'Items per row' is not that simple function at all. Maybe it's not a right all to use icon for this action?