The document defines different types of jubilees that mark anniversaries: - A silver jubilee marks a 25th anniversary such as a monarch's 25 years of reign. - A golden jubilee is a 50th anniversary celebration, for example of a monarch's rule. - A diamond jubilee marks a 60th anniversary like a monarch's 60 years on the throne. - A platinum jubilee typically refers to a 70th anniversary celebration for a monarch. Thailand's King Bhumibol Adulyadej recently celebrated a platinum jubilee before his death.