Backprime

The echo and sed commands appear within backprimes (`) that indicate command substitution: The result of executing the commands within the backprimes replaces the backprimes and everything between them.

Source: wiktionary

Since deformation manifests itself as a change in the metric characteristics of continuum, in the theory of finite deformations, it is then necessary to compare the referential ‵g_(ασ) and the convective g_(ασ) metrics. We systematically employ Latin indices in order to refer to spatial components of geometrical objects, whereas Greek indices to point on convective components (only a few instances can be found in the present study) or referential components (additionally, root symbol is sometimes supplied by backprime).

Source: wiktionary

Hang and adjust the rate or set the infusion pump as indicated. If using an infusion pump, follow the specific manufacturer's guidelines to backprime the secondary set.

Source: wiktionary

I'm assuming a well-built building, with clear pine trim and vertical-grain red cedar clapboards. The first step is to backprime the trim and siding. Backpriming is simply painting the back of the boards — the side against the house — with oil-base primer before they are installed.

Source: wiktionary