X is for that circle* symbol with the big X in the center of it.

Like this:

As in~ that's a really pretty heart!  Except wait.  It looks cracked, which means dang it!

Huh.  Those pieces kind of look like wings.  What would happen if I grind the jagged edges until they are smooth and lay them down at a different angle.....

Do you hear them begging to take flight in bead embroidery? 

Uh!  Me Too!

So much so in fact that I had to see if I could do it again, but this time on purpose....

And now I am addicted to making hearts and super cooling them until they crack down the middle and become wings.

Which has nothing further to do with the letter X, not that it ever really did.

~~

*circle/oval.  Kinda the same only different.