Series reside in the historical catalog (United States » Labor markets » Insured Unemployment Characteristics » by age|gender|industry|ethnicity|race) and include, for example:

• XUIA022%M.IUSA = Insured unemployment by age: 0 to 22 years, (%, NSA) for the U.S.
• XUIGM%M.AK         = Insured unemployment by gender: Male for Alaska
• XUIIWTWM.ME       = Insured unemployment by industry: Average weekly total weeks claim, (#, NSA) for Maine

Because catalog locations are subject to change, the upper-right search box on DataBuffet.com provides a "find in catalog" mode that accepts a mnemonic.