The official state seal of Maine was adopted in 1820. The farmer is a symbol of pride in Maine's agricultural roots. The sailor represents Maine's strong ties to the sea. Symbols of the natural richness of the state are pictured on the center shield - a pine tree, a moose (Maine's official state animal), sea, and sky. The seal design also appears on Maine's state flag.

Above the coat of arms shines the North star and Maine's motto: DIRIGO (I Lead, or I Direct), below is the word MAINE in capital letters.The North star (Polaris) also appears on the state flag of Alaska. Polaris is not merely a symbol of guidance - travellers have depended on it for many centuries to find their way (it always marks due north). See all the great seals of our 50 states.

Source:

State Symbols - State Seal: Maine SOS Kid's Page
Great Seal of the State of Maine: Maine Secretary of State

Links:

State Seals - 50 States List
National Seal