black widow
it is a design for protection and its on the cephalothorax
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.
The white-backed spider is a common name for the Steatoda nobilis, a species of spider known for the white marking on its back.
The spider you are referring to is likely the brown recluse spider, which is known for its brown coloration and dark violin-shaped marking on its back.
circle
Black Widow
That would be the Hentz Orbweaver!
That's going to become the 'radius' of the circle you draw.
A black spider with a brown stripe has a distinctive marking that sets it apart from other spiders.
By marking out 10 arcs of 36 degrees around its circumference and joining them to the centre of the circle.
A snowdrop spider is a small, black spider that has a distinctive white or pale marking on its abdomen resembling a snowdrop flower. It is also known as the "ghost spider" due to its appearance.
a 2 with a circle around it,is the marking for sprague. If you have this,you have a sprague capacitor.