Hi,
The first screenshot shows a symbol which appears when you hover crosshairs over an object with parametric constraint applied to it.
The second screenshot shows the points on the objects where parametric constraints applied to them.
BTW this feature (parametric constraints) available in AutoCAD on both platforms - Windows and OS X.
About Geometric Constraints
http://help.autodesk.com/cloudhelp/2016/ENU/AutoCAD-MAC-Core/files/GUID-7D93999A-6CAF-4F54-B7E5-DD2A...About Applying and Deleting Geometric Constraints
http://help.autodesk.com/cloudhelp/2016/ENU/AutoCAD-MAC-Core/files/GUID-953BD552-4B04-4CFD-ADB5-175B...About Inferring Geometric Constraints
http://help.autodesk.com/cloudhelp/2016/ENU/AutoCAD-MAC-Core/files/GUID-3CEDC74D-742F-465D-BD83-DD2B...To Delete All Geometric Constraints From an Object
http://help.autodesk.com/cloudhelp/2016/ENU/AutoCAD-MAC-Core/files/GUID-9802D8EB-2AAC-45E0-B1BC-7CC7...Maxim
