You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

fear of needles (medically known as belomophobia) is a term used to describe a large fear (phobia) of medical procedures involving needles.
Solution: fear of needles
Why? in this statement, we are talking about the fear of needles hence the output of the statement is fear of needles

New input: the julian day or julian day number (jdn) is the number of days that have passed since the initial epoch defined as noon universal time (ut) monday, 1 january 4713 bc in the julian calendar.
Solution:
julian day