📖1️⃣1️⃣.2️⃣

#chapter #book chapter #document section #reference point #subsection

⛰️📍📐

#surveying #survey mark #reference point #elevation mark #geodetic mark #leveling #datum point

🎯📌

#target point #fixed value #desired level #reference point

🎯📈

#reference point #target value #graph marker #data point

📍🌍🕰️

#prime meridian #gmt #reference point #world time #longitude zero #time standard #location time