Surgical implements
Arpeggio
On an electrical schematic it designates that the wires are all connected together. It is called a connection point.
I believe you are describing hatching.
A wood stove should be placed at least 36 inches away from a wall for safe and efficient operation.
Two or more kinds of matter placed together but which can be easily separated is called a mixture. In a solution, the stuff that is dissolved (the solute) "disappears" into the liquid (solvent) and separating the two isn't as easy as separating a mixture.
A well placed observer can compromise the entire operation is security. The site must be secure from attack and from observation.
security
Usually placed together but, if there are values, within the overall range, for which no observations are possible, they could be spaced out.
Security
security
Organisms that are related are placed on branches that are close together in a tree of life called a phylogenetic tree. This tree illustrates the evolutionary relationships among various species, showing how they have diverged from common ancestors over time. The closer the branches, the more closely related the organisms are, reflecting their shared evolutionary history.
it was then placed in the pyramids built for them wich were called tombs