This page is a list full-width version of common English characters in Unicode.
A full-width char basically means that each character has the same width as a Chinese character, regardless of font choice. They are used mostly in {Chinese, Japanese, Korean} texts.
０ １ ２ ３ ４ ５ ６ ７ ８ ９
Ａ Ｂ Ｃ Ｄ Ｅ Ｆ Ｇ Ｈ Ｉ Ｊ Ｋ Ｌ Ｍ Ｎ Ｏ Ｐ Ｑ Ｒ Ｓ Ｔ Ｕ Ｖ Ｗ Ｘ Ｙ Ｚ
ａ ｂ ｃ ｄ ｅ ｆ ｇ ｈ ｉ ｊ ｋ ｌ ｍ ｎ ｏ ｐ ｑ ｒ ｓ ｔ ｕ ｖ ｗ ｘ ｙ ｚ
， ． ： ； ！ ？ ＂ ＇ ｀ ＾ ～ ￣ ＿ ＆ ＠ ＃ ％ ＋ － ＊ ＝ ＜ ＞ （ ） ［ ］ ｛ ｝ ｟ ｠ ｜ ￤ ／ ＼ ￢ ＄ ￡ ￠ ￦ ￥
In the above, there are no space between adjacent characters. Every character's width is the same to each other, regardless of font. Nor are they displayed using a monospaced font. (if you see different widths, that means the particular font used is designed incorrectly, or your browser is rendering it incorrectly.)
The list above is the complete list of full-width characters that are also parts of English punctuation. It's not a complete list of full-width characters.
In Asian languages, almost every symbol used is full-width. For example, the “IDEOGRAPHIC COMMA” 、 〔☛ Intro to Chinese Punctuation〕, and many types of Asian brackets 【 】 〔☛ Unicode: Brackets and Quotation Marks〕. Asian language's writing system tend to use lots more symbols, such as circled numbers ➀ ➁ ➂, WAVE DASH 〜 (which is different from FULLWIDTH TILDE ～), and many more.