Heck, I've been into knives for around 45 years, been on this forum for over 21 years, and I've never recognized or followed any "official" rules regarding what to call each side of a knife. I typically just say "front" or "back".
If a knife has a distinguishing feature on one side, like a shield, or in the case of a switchblade, a button, I refer to the front side as the "shield side", or the "button side", and refer to the other side as the back. Never once in my life have I ever used the term "pile side" to refer to the back of a knife. And yet I don't believe anyone has ever had any difficulty understanding what I was saying.
I wouldn't get too hung up on terminology. There are no rules about such things. Everybody simply chooses their own terms. All that really matters is that people understand what you're saying. And even if they don't, heck, it's not like any lives hang in the balance . You won't be kicked off the forum or cast out of the knife community.
Welcome to Bladeforums Rover-Friskey