In web pages or pages written in html, < stands for the < symbol.
Another symbol you frequentely find is the opposite: > written >.
I wrote this little post because i’ve seen a lot of people fighting against these two HTML entities, mainly when selecting, copying and pasting code directly from webpages. Sometimes, as paradox, some web software could translate them back showing actually the entity in place of the symbol.
Hope this post helps understanding and using this HTML predefined chars.