To add 'st', 'th', 'nd' or any other unicode to your text, you would use subscripts or superscripts HTML markup.
Superscripts
An example of a superscript would be the 'th' in a date such as the 4th of July.
You can create a superscript by using the tags
HTML | | copy code | | ? |
1 | <sup></sup> |
Subscripts
An example of a subscript would be the 'hex' in a mathematical expression Chex.
You can create a subscript by using the tags
HTML | | copy code | | ? |
1 | <sub></sub> |