Its called The "Katipo spider"
The zebra spider has distinct lines on its back.
The white-backed spider is a common name for the Steatoda nobilis, a species of spider known for the white marking on its back.
A brown spider that has a white diamond on its back is known as a Parson spider. This spider does have a mildly venomous bite.
The spider with a white sack on its back is likely a female wolf spider carrying her egg sac.
The unique characteristic that distinguishes a spider with a white back from other spider species is its distinct coloration, specifically the white color on its back that sets it apart from other spiders.
The distinguishing features of a brown spider with white spots on its back are its brown coloration and the presence of white spots on its back.
The spider you are referring to is likely the black widow spider. The female black widow has a distinct red hourglass shape or white crescent on its abdomen. They are known for their venomous bite, so caution should be taken when encountering them.
Have seen a very small spider with 4 white dots and 1 red dot. Not a red back. Ta ~Snaff
The worst kind.
Black widow
The distinguishing features of a small brown spider with white spots on its back are its small size, brown coloration, and white spots that are visible on its back.
If you encounter a big black spider with a white stripe on its back, it is likely a black widow spider. Stay calm and slowly back away from the spider. Do not try to touch or handle it. Contact a pest control professional to safely remove the spider from your surroundings.