What are some examples synedoche?

Synecdoche is a figure of speech in which a part represents the whole or vice versa. Common examples include using "sails" to refer to a whole ship, or "the crown" to represent a monarchy. Another instance is saying "all hands on deck," where "hands" refers to the crew members. Lastly, referring to a car as "wheels" highlights just a part of the vehicle to represent the entire object.