Is it possible to create your own unicode symbol to use it as part of unicode text, like in create your own font from handwriting?

Not really. Unicode is a standard. The characters are defined and characters can not be inserted or removed.

There are modifications available for Unicode. UTF-8 is a popular one. So, it would be possible to create your own standard.

However, a standard is only as powerful as the people who use it and if you create your own, it would likely only define your character set and would loose many of the advantages of unicode itself. Here is the Wikipedia article on Unicode: en.wikipedia.org/wiki/Unicode_(UTF-8).

Unicode is a code map or a number which maps to a glyph representing the symbol. A standard committee approves new glyphs, so Unicode 2.0 and Unicode 3.0 will differ in the new glyphs added.

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