What's the index node and index page in DB2

Could you please explain what the index node and index page in DB2, and what's the relationship between them?

Following paragraph is copied from tadm56.
Tables contain records of data. One or more records of a table are stored in a DB2 data page. Pages are the minimum I/O unit of DB2. A DB2 data page can contain one or more records. But a record must fit in a data page.
If a record of a table does not fit in a 4096 byte (4 KB) page, the table must be defined in a tablespace that is based on a larger page size. DB2 also provides page sizes of 8192 bytes (8 KB), 16384 bytes (16 KB), and 32768 bytes (32 KB).
For improved access to data, indexes are predefined by SAP developers. Indexes can also be defined later as further need arises. An index is defined using a few columns of a table, which are accessed frequently. Index data structures allow for efficient retrieval of small quantities of data. Indexes are based on nodes, their storage is maintained within DB2 index pages. Because the pointers pointing to other index nodes are also stored in the index pages, storage of indexes is not as compact as the storage of data records.
And above this paragraph, there is a figure that shows relationship. I don't know how to paste a picture here. In the figure, it shows that table records vs data page is n:1, and index nodes vs index page is 1:1.
How to understand index nodes vs index page is 1:1?

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Device Types for SAP Output Devices (Detail Information)
Definition
The device type indicates the type of printer to be addressed. When you define an output device, choose the name of the device type that was defined in the SAP System for your printer model, such as Post2 for a PostScript printer. In the case of frontend printing under Microsoft Windows, you can also use the generic (device-independent) device type SWIN.
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SCB
Date: Tue, 1 May 2012 17:55:18 -0600
From: [email protected]
To: [email protected]
Subject: What does the grey box and brush in some project bin images mean?
    Re: What does the grey box and brush in some project bin images mean?
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What's the index node and index page in DB2

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