This is the great symbol of Papa Alegba!
He is a kind and powerful spirit and he makes communication between the spirit world and the “physical” world possible. He is a rada lwa, the gatekeeper, the man at the crossroads.
Here is a song for Papa Legba:
“Little good Legba open the door for me!
Little good Legba open the door for me!
Open the door for me, for me to pass,
when I return I will thank the lwa!”