Pharaoh's serpent
Concise Oxford English Dictionary © 2008 Oxford University Press:
Pharaoh's serpent
▶noun an indoor firework producing ash in a coiled, serpentine form as it burns.
– origin named by assoc. with Aaron's staff, which turned into a serpent before the Pharaoh (Exod. 7:9).
'Pharaoh's serpent' also found in these Oxford entries:

