Tests in TDD is different from unit tests?

read this book again:
http://www.china-pub.com/computers/common/info.asp?id=19120
[url]http://www.amazon.com/exec/obidos/ASIN
/0131016490/qid=1097646507/sr=2-3/
ref=pd_ka_b_2_3/103-9945153-2808617[/url]

It's very weird to read: "Tests in TDD is different from unit tests"

For me, I think unit tests is same with tests in TDD except in TDD you need write tests first, but they are unit tests, aren't they? Or the difference indicate different feeling?

What's your thoughts?