Signature, the author handwritten his name in the book. Stamp, the name written by the author printed by the later publishing house. Special signature, in addition to personal signature, there are extra handwritten sentences by the author, usually classic sentences in books or something. To sign, readers can specify their own sentences to help them write, generally writing "toxxx" (for xxx), so it is called signature, and it is also the most rare signature.

The number of signatures of each author may be different, some are random, depending on luck, some are the first few signatures, or the first few seconds, the spelling is hand speed.