Alphabets are just symbols that have some sort of meaning to you. Alphabets in a row are text.
There are symbols that have no meaning to you but still are te xt such as Kanji or Korean alphabet for some people yet you consider them text.
Unicode has nothing to do with what is considered text. Humans have for millenia used pictures as symbols that are used for text, in egypt for example.
Would you consider integrals, powers, and fractions text? For readability, the usual notation uses two dimensions.
They can be written in one dimension of course, but so can anything that would count as language (given that all information can be written as a row of 0s and 1s).
