The most widely used of all ISA standards, ISA-5.1, Instrumentation Symbols and Identification, has been published in a 2022 version ... Most of the identification letter and symbol meanings or ...

Symbols show important landmarks, places and areas. They are used because maps are usually too small to contain lots of writing A key is a guide which explains what the symbols on the map mean. It ...

Map symbols show what can be found in an area. Each feature of the landscape has a different symbol. Contour lines are lines that join up areas of equal height on a map. By looking at how far ...