Dragon Dictate has many built-in letters and punctuation marks that you can say during dictation. In other words, these are among the things that Dragon Dictate will type for you.
Letters and punctuation (symbols) that Dragon Dictate will type for you in Dictation mode are also listed in the Vocabulary Editor window. The list here in the online help, however, arranges information about symbols by category, shows you the names that you need to use in order to dictate each symbol, and adds information about Spelling mode symbols (which are not listed in the Vocabulary Editor window).
Here are three lists of symbols:
Letters that you can say in Dictation mode.
Letters and numerals that you can say in Spelling mode.
Punctuation that you can say in Dictation mode or Spelling mode.