The YL Young Ladies Amateur Radio Clubs that represent a list of links to amateur radio clubs dedicated to the promotion of ham radio among women.
The origin of YL term:
Typically YL is a ham radio term for a girl friend (Young Lady), while a Wife would be a XYL
“Many OMs have used XYL (meaning Ex-Young Lady) to describe a wife versus a single lady, but some women, though not all, take offense at this term feeling that getting married does not mean a female is no longer a Young Lady.”
You may read a more detailed and exaustive article on origin of these terms at the YLRL history page, where you can learn how the term was born and how it has assumed the nowdays meaning.