[Tsukiko]

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.

[bluerobotcat]

Note that Unicode includes hieroglyphs: https://en.wikipedia.org/wiki/Egyptian_hieroglyphs#Unicode

[edmoffo]

Not just hieroglyphs... Unicode includes anything you can imagine

[bluerobotcat]

It includes many things, but not, for example, an 'i' dotted with a heart. And to represent mathematics well you need to use MathML.

[Someone]

There was a request for it: http://www.evertype.com/standards/iso10646/pdf/n258a-heartdo... (but do note the date)

[Tsukiko]

What unicode does or does not include doesn't matter.

[bluerobotcat]

I just wanted to clarify this because I got the impression you were implying they weren't.

[bluerobotcat]

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).