Final answer:
Shakespeare frequently uses a couplet, two lines of poetry with an end rhyme, to signify the end of a scene in his plays.
Step-by-step explanation:
The literary device that Shakespeare often uses to indicate the end of a scene is the couplet. A couplet consists of two adjoining lines of poetry that share an end rhyme. Most of Shakespeare's plays end scenes with a couplet, which helps to signal a conclusion and provides thematic closure. For example, many of Shakespeare’s sonnets end with a couplet, emphasizing the end of the poem. The use of couplets in drama and poetry was common during the Elizabethan era, with notable examples found in his plays.