Invoking of the muse is a tradition of poets and writers, as a symbol of starting their poems and also serving as a prologue for the events to come. This invocation is an address or prayer made to someone, normally one of the goddess of the Greco- Roman mythology.
Dante Alighieri also invoked the muses before he started writing or proceeding with his epic "Divine Comedy". This is notable not only because of the epic status it was meant to be, but also to show his respect for the artistic tradition that has been followed by many of the great writers before him. His decision to invoke the Muses is notable because it reveals his respect for artistic tradition and also his taking forward of this tradition.
American sign lanuguage is good because it help communicate with others if you have any type of disorder. It also can be bad because if the person is misunderstood you wouldnt be able to fix it, for they will be misunderstood again.