Figure of Speech
Alliteration is the repetition of the initial consonant sound in several words in the line.
Example- So we must lough and drink from the deep blue of the sky
Join the Jubilant song of the great stars sweeping by
And the grave is not its goal
For the soul is dead that slumbers
Be not like dumb, driven cattle!
So let us, Unobtrusive and unnoticed
If you check in above sentence, the highlighted letters are repeated in a line . so it is called Alliteration.