Pinyin table list all pinyin symbol, its English letter for keyboard input, type(Initial-I, Finals-F, Unique PinYin rule-U), its sequence order in that type, and further we group them for beginner to memorize them.

It has the following fields :

Pinyin symbol  Text field Yes  
English letter  Text field Yes  
Type  Menu field I F or U
Group  Menu field No  
Audio  File field No  
Ordering  Number field No
Spelling_rule  Text field No

Pinyin symbol: iu
English letter: IU
Type: F
Group: 2
Audio: Audio file (MP3) iu.mp3
Ordering: 12
Spelling_rule: Simplified from IOU, it should sound I and OU (邮), and use YOU if there is no initial