Data preprocessing isn’t just number crunching — it’s the cleanup crew making raw info usable. Use 📊🔍🧹 to show data cleaning steps, or 💾🧩📉 when saving puzzle pieces of analytics. When you’re deep in testing and tuning, 📊🔍🧪🔧 fits right. Great for project updates, code reviews, and sharing progress on datasets before the big analysis begins.