1: the character 'shi' is an exception to the s characters in that it contains an h. as shown in the pronunciation brackets it is pronounced differently too. note
2: the character 'ji' is an exception to the z characters in that it starts with a j. as shown in the pronunciation brackets it is pronounced differently too. kc says: when combined with a little (lower-case) character you compress the sounds of the two characters, making new (more rarely used) characters; pronounced as shown. only the characters shown here can be compressed in this way.
examples - sushi (means 'japanese raw fish and rice')
- sumimasen (means 'excuse me')