Look up calligram in Wiktionary, the free dictionary.
A calligram is a poem, phrase, or word in which the typeface, calligraphy or handwriting is arranged in a way that creates a visual image. The image created by the words expresses visually what the word, or words, say. In a poem, it manifests visually the theme presented by the text of the poem. Guillaume Apollinaire was a famous calligram writer and author of a book of poems called Calligrammes. His poem written in the form of the Eiffel Tower is an example of a calligram.