What does the exclamation point (!) mean?

The exclamation mark is used to express some sudden feelings like excitement , joy, happiness, sympathy, pleasure , dislike, tired feeling, confusion, nervousness , anger, relaxed feeling , jealousy, etc.

"Westward Ho"! is the only English place name with an exclamation mark, it is a seaside village in Devon. The name derives from the 1855 novel of the same name by Charles Kingsley, which was set nearby, and was chosen to try and promote the area as a tourist destination.