Make a character from an entity:

Make a graph from an entity:

Give a quantity corresponding to a physical constant entity:

The "Entity" property of GraphData can be used to return an entity on which FromEntity can operate:

Return the graph directly using the "Graph" property:

"Graph" is also the default property for GraphData:

Any member of "AlternateStandardNames" can be used together with "Entity" in GraphData to return an entity on which FromEntity can operate:

For colors, FromEntity typically gives the same results as returned by ColorData:

FromEntity can return graphs for certain indexed families even though they are not known to GraphData:

This graph is not known to GraphData:

But it is known to EntityValue:

Non-entity Wolfram Language representations are not available for all entity types:

Applying ToEntity to FromEntity does not round-trip for colors:

The result of FromEntity may evaluate if the underlying symbol autoevaluates:

Compare with result of evaluating the symbol Red:

Different mathematical function entities may convert to the same Wolfram Language function: