For BOLD text, use an asterisk (*) symbol at the beginning and end of a word (or words).
Example: *Google Plus Bold* = Google Plus Bold
For ITALICS, use an underscore (_) symbol at the beginning and end of a word (or words).
Example: _Google Plus Italics_ = Google Plus Italics
For STRIKETHROUGH, use a hyphen (-) symbol at the beginning and end of a word (or words).
Example: -Google Plus Strikethrough- = Google Plus Strikethrough