A basic camping tent, a house roof, and the iconic Toblerone box.
tent
Some of the pyramids in Antarctica resemble a triangular pyramid.
A pencil.
stuff
The Equator is a real world example, being the circumference of the Earth.
roof
Roof of a house
tent
A tent
Pup tent or lean-to
A real life example is a Toblerone chocolate bar which is in the shape of a triangular prism.
If you asking where you'd find them in the real world - Binoculars and telescopes are two examples.
Some of the pyramids in Antarctica resemble a triangular pyramid.
The object you are describing is a triangular prism. A triangular prism has five faces: two triangular bases and three rectangular lateral faces. The two triangles are the bases of the prism, while the rectangles connect the corresponding edges of the triangles. This shape is commonly found in geometry and various real-world applications.
any box of tampons
Three real-world examples of prisms include a glass of milk, which can be shaped like a rectangular prism, a triangular prism as seen in the shape of a Toblerone chocolate bar, and a crystal prism used in optics to refract light into a spectrum of colors. Additionally, the shape of a brick is another common example of a rectangular prism found in construction. Each of these examples illustrates the geometric properties of prisms in everyday objects.
A cereal box or a t.v. [not flat screen] or a book.