Ever since humans have inhabited the Earth, they have made use of 1 forms of communication. 2, this expression of thoughts and feelings has been in the form of oral speech. When there is a language barrier, 3 is accomplished through sign language in which motions stand for letters, words, and ideas. Tourists, the deaf, and the mute have had to resort to this form of 4. Many of these symbols of whole words are very picturesque and exact, and can be used 5; spelling, however, cannot.