What does the windover symbolize in the poem, The Windhover?

The windhover symbolizes God's power. The central symbol of the poem, the windhover and its stunning movements paralyze and entice the speaker, ultimately leading him to meditate on God as the creator of beautiful creatures. That this particular bird can both hover in stillness in the air and swoop down suddenly to catch its prey underscores the speaker's awe over God's ability to create such complex and logic-defying beings on earth.