I was browsing through the Taiwanese version of apple.com. When I was checking out the iPad Air 2 section, one of the image showed the iPad keyboard with some characters that I have never seen before. Are they Chinese or Japanese? From what I have learned, they are not in hiragana and katakana scripts. And also, what is their meaning? Thanks.
They are Bopomofos (注音符号): https://en.wikipedia.org/wiki/Bopomofo
According to Wikipedia, Zhuyin fuhao, Zhuyin or Bopomofo is a system of phonetic notation for the transcription of spoken Chinese, particularly the Mandarin dialect.
It's zhuyin (注音) , or bopomofo in English. Just as hanyupinyin/pinyin (漢語拼音/拼音) is the phonetic 'spelling' system in Mainland China, it's zhuyin in Taiwan. Zhuyin is taught in kindergartens and elementary schools, and people use it for typing and looking up in dictionaries (not the only way for typing and dictionary lookup though).