The different types of fonts that Whatsapp has provided for use are :

1) Bold ( * ) - Asterisk(Star)
In Message: *Hello World*
On Handset: Hello World

2) Italic ( _ ) - Underscore
In Message: _This is a Italic font_
On Handset : This is a Italic font

3) Strikethrough (~ ) - Curly Hyphen (Below Escape(Esc.) button)
In Message: ~This is a StrikeThrough~
On Handset :


4) Monospace (```) - Hyphen -
In Message: ``` This is a monospace Effect ```
On Handset :


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