"Specific page number" refers to a particular number assigned to a page within a document or a book. It helps you find and refer to that exact page instead of searching through the whole document. Full definition
As a Print Replica title is downloaded, the exact word count per page is preserved, allowing for finding key information on specific page number locations, a vital tool for utilizing research tomes and textbooks where all users need to be able to reference the same page number. (goodereader.com)
From there you can enter a specific page number to go to, use the page slider, access the table of contents, which supports multiple levels, and enter history mode. (the-ebook-reader.com)
The update will now allow users to carry out such tasks like jump straight to a specific page number of a book, to perform search within a book, view notes and highlights or to remove e-books from your library. (goodereader.com)