"Big Ben" is technically the nickname of the Great Bell of Westminster, housed in the Elizabeth Tower (formerly the Clock Tower) at the Palace of Westminster. The moniker's exact origin is debated, but two leading theories persist.
The most widely accepted explanation credits Sir Benjamin Hall, the First Commissioner of Works when the bell was installed in 1859. Hall was a large, imposing man, and colleagues jokingly named the massive bell after him.
An alternative theory links the name to Benjamin Caunt, a famous heavyweight boxer of the 1850s known as "Big Ben" for his size and strength. The bell's sheer weight (13.7 tonnes) made the comparison fitting.
Regardless of which story is true, "Big Ben" has become synonymous with the clock tower itself and stands as a global symbol of British heritage and parliamentary democracy.