Pinchers in the back sounds like an earwig.
It sounds like the description of an assassin bug. Assassin bugs have a distinct orange head with pinchers for mouthparts, a striped body, and six legs. These bugs are beneficial predators that feed on other insects.
Many animal species have pinchers. Crabs, scorpions, shrimps, lobsters, and some bugs like beetles all have pinchers along with many others.
The name of a black bug with a red spot on the back is the bordered plant bug nymph. They look much like a beetle and are found in Arizona, California, Arkansas, Georgia, Mississippi, and South Carolina.
There are a few small bugs that are triangular in shape namely Troilus luridus, Sloe Bug, Striped Shieldbug, Green Shield Bug.
Sounds like a "Devil's Coach Horse" (Creophilus erythrocephalus) beetle
Ants Earwigs have the pinchers or "cerci" at the back end.
the lobster-like insect is called a 'pseudoscorpion'
The black bug with an orange back is commonly known as the "milkweed bug."
The name of the black bug with silver on its back is the silverfish.
All insects have six legs. There are many many tiny ones. You need to be more specific.
The black bug with red lines on its back is commonly known as a "boxelder bug."
The bug with black spots on its back is commonly known as a ladybug.
That could very well be a pseudo scorpion. They can be very small and have pinchers. If you would have said it was anything bigger I'd have said an earwig. Look at the links for pics.
The small brown bug with a black line on its back is commonly known as a "boxelder bug."
The insect you are referring to is likely the "milkweed bug," which is black with orange markings on its back.
If you encounter a large bug with pinchers in your backyard, it is best to avoid touching it and keep a safe distance. You can try to identify the bug from a distance and research if it is harmful or not. If you are unsure, it is recommended to contact a pest control professional for assistance.
The small brown bug with black spots on its back is called a ladybug.