Final answer:
The syringe tip with a spiral top is called a Luer Lock, featuring a threaded twist-on mechanism providing a secure connection to the needle.
Step-by-step explanation:
The name of the syringe tip with a spiral top is known as a Luer Lock. This type of tip allows for a secure connection between the syringe and the needle, ensuring that the needle does not slip off during administration. The Luer Lock tip features a threaded twist-on mechanism, which differs from the Luer Slip that simply slides on and is held by friction, the Catheter Tip that allows for a larger opening for thick fluids, and the Eccentric Tip, which is off-center for instances where the syringe needs to be parallel to the skin.