The answers provided earlier are accurate. However, it is possible to achieve different fonts by using Unicode characters. For instance, compare the standard word javascript
to this title I found in the source code of reddit.com/r/javascript:
𝚓𝚊𝚟𝚊𝚜𝚌𝚛𝚒𝚙𝚝
- you can see the subtle differences.
Without code formatting: javascript
Reddit's title without code formatting: 𝚓𝚊𝚟𝚊𝚜𝚌𝚛𝚒𝚙𝚝
You can paste these characters anywhere and they will appear distinct because they are technically different characters. There's 'a' and then there's 𝚊 - taken from the word 'javascript' I mentioned earlier.
The origins of these characters are unknown to me. I am unsure how to type them or where one could find them to copy and paste.
However, it is worth noting that any emoji can be used in these titles. You can find emojis to copy and paste from