أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
When all or most of the words in a particular sentence begin with the same letter it is called an alliteration, but the example you gave is more commonly known as a tongue twister. A better example of an alliteration is something ridiculous like Seven Silly Sausages.
