Maples have fan-shaped leaves with 3 to 7 lobes that radiate out from a central point like a fan. This can best be seen by examining the main veins. Most have 5 lobes but some have 7 or more. Five examples are shown first.
Some trees have fan-shaped leaves but are not Maples. Five examples of these trees are shown below.
Japanese Maple (7 or more lobes)
Wild Service (note that all veins do not radiate from a single point)