Plain English Meaning
It is the visual language of aeronautical charts. Every shape, color, and mark on the chart stands for something specific, and the legend tells you exactly what each one means.
Full Definition
The standardized set of symbols, lines, colors, shapes, and abbreviations used on aeronautical charts to represent navigation aids, airspace, airports, terrain, obstacles, fixes, routes, and procedural information. Each symbol carries a defined meaning published in the chart legend so that any qualified pilot reading the chart interprets it the same way.
Context Anchor
Seen when reading instrument procedure charts, charts, , and chart legends.