Trafalagar can mean many things to people. In London, it means Trafalagar Square, a social gathering place.
It can also mean the ships that were at the battle there.
Trafalagar is also a rocky cape 9 miles from Gibraltar, and a sea battle was fought here.
200+ years ago, a sea battle was fought between the British and the combined fleet of England and Spain. If England had lost, it would fall to Napoleon. 27 ships of the line for the uk beat 34 spanish-french ships, and preserved the seas and England for years to come.