What is pin oak?

Famous quotes containing the words pin and/or oak:

“A man is a beggar who only lives to the useful, and, however he may serve as a pin or rivet in the social machine, cannot be said to have arrived at self-possession.”
—Ralph Waldo Emerson (1803–1882)

“Where he swings in the wind and rain,
In the sun and in the snow,
Without pleasure, without pain,
On the dead oak tree bough.”
—Edward Thomas (1878–1917)