What kind of altitude does a symbol indicating 4600 with a solid line above it represent?

The symbol indicating 4600 with a solid line above it represents a maximum altitude. This symbol is commonly used in aviation charts, particularly in terminal airspace and along airways, to indicate that aircraft must not exceed this altitude while operating in that specific airspace. The solid line above the altitude value signifies a ceiling or limit, which is essential for maintaining safe vertical separation between aircraft and compliance with airspace regulations.

In this context, understanding the various altitude indicators is crucial for pilots to ensure safe navigation and adherence to air traffic control instructions. Recognizing that an altitude marked with a solid line above indicates a maximum helps pilots avoid potential conflicts or exceeding altitude restrictions when flying within busy airspace or near terrain features.