Nice observation op. Well op, means original poster or original post. It's simply means that you were the one who created the post. If you would like, you can checkout some of these threads containing acronyms used in Bitcoin and the forum it self
Definition of some short Abbreviations used on forum. Everyone should know
Crypto acronyms and their meanings for beginners (CHECK OUT)
The beginners guide to Blockchain & Cryptocurrency

You should also try to use the search buttons more often, as easier since you get to see previous and similar threads regards your question.