Firey Serpents
Serpents are sacred in many world religions and mythologies, associated with wisdom.
The serpent is the oldest symbol for the Earth. This one is a cobra, the Naga of Hindu religion, and the cobra's hood is considered to be its wings. The fire is Kundalini energy, and related to the fire of the Holy Spirit.
Some Christian folks get nervous when they see an image of a serpent in flames, assuming it to be Satanic. Not so: the symbol is associated with Kundalini, often depicted as a winged, firey serpent.
In several places in the Bible, including Revelations, fiery winged serpents are seraphim; a class of angels. So, as the Angels say, "Fear not!"
The cadeucus is the symbol of fully awakened Kundalini, also widely used as a symbol of medical care. You see it on pharmacies and ambulances.
A staff with a single serpent is called the Rod of Aaron, associated with the magic staff of Moses.
Numbers 21:8-9: "And the LORD said unto Moses, Make thee a fiery serpent, and set it upon a pole..."

Jesus, referred to himself as a snake on a stick!
"And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up:
That whosoever believeth in him should not perish, but have eternal life."
-John 3:14-15, KJV
My work is all kundalini related, and graced by various logos, images of the Fire Serpent. The Fire Serpent is Kundalini; serpent fire is Kundalini energy. My online Kundalini Tantra course is called Fire Serpent Tantra. The form of Tummo I initiate people is Serpent Fire Tummo.