I am wondering the same thing. I have one that hangs out on a column on my front porch. It's mostly white with black on its legs and a arrow on its back pointing towards its head. I have been searching, but no ones seems to know.
If the mark is red it's a black widow
That would be the Hentz Orbweaver!
a black spider
A spider that has a brick colored heart-shaped marking surrounded by white on its back and lives on the ground might be an orb spider or a white tail spider. This spider might also be a common garden spider found in much of the U.S.
a black widow
Could be the arrowhead spider.
The spider that is black with a white crescent on its back is the Brown House Spider. This spider is often confused with the red-back spider.
A wolf spider
Female Mouse Spider
a garden spider
it is a spider
A U with an arrow through it on a diamond ring does not have a significant meaning. It is most likely an engraving or marking of some kind.
A Brown and Black spooky spider!