Entry door bottom aluminum cap: What's it called?

The trailer I purchased is in excellent shape. I've spent very little cleaning it up. But the front entry door has no aluminum cap on the bottom. Yes, the wood at the bottom has rotted, and I plan to remove and fix up the door. But.....

I presume it is extruded aluminum, but is it an item that can be purchased? If so, is there a specific "name" when I'm looking or asking around?

If it can't be purchased, what is a reasonable replacement? Angle aluminum?

Thanks for any help.