lute
10cm2
Two tetrahedron stuck together by a face.
a triangular prism * * * * * or a triangular dipyramid (two triangular pyramids stuck together).
I believe what you are thinking of is an octahedron. It resembles two pyramids with square base that are joined.
The medical term for when two toes are stuck together is syndactyly.
two cat fish stuck together
Two amplifiers stuck together.
A molecule
lute
10cm2
Two flies may become stuck together due to a mating behavior called "mating in copula," where the male and female flies physically connect during reproduction.
A chain reaction is more likely to occur in two separate pieces of uranium-235 due to increased chance of neutron interactions. When two pieces are stuck together, neutrons are more likely to escape without causing additional fission reactions.
More like two tetrahedrons stuck together.
It is called interlocking, where two objects become entwined or stuck together after a collision.
When two people are born physically connected to each other, it is known as conjoined twins. This occurs when the fertilized egg begins to split into identical twins but does not fully separate.
Two tetrahedron stuck together by a face.