LLLL = 4 Letter .com

Anti-Premium: A domain name that contains only non-premium letters. An anti-premium domain is a domain which is composed strictly of letters: J,K,Q,U,V,W,X,Y,Z. The term Anti-Premium is most commonly applied to 4 Letter .coms. Examples of Anti-Premium LLLL.coms include: WKQU.com, XYQZ.com, YQUW.com, KQJV.com.Anti-Premium LLLL.coms are the lowest quality LLLL.coms on the market and are generally among the cheapest.
Single Premium: We use this term to refer LLLL.coms containing only one premium letter.Examples of Single Premium LLLL.coms include: JHXZ.com, UQTX.com, WQUE.com, EUWJ.com.
Double Premium: We use this term to refer to LLLL.coms containing two premium letters.Examples of Double Premium LLLL.coms include: ASWQ.com, BJKT.com, WVMG.com, HWRZ.com.
Triple Premium: We use this term to refer to LLLL.coms containing three premium letters.Examples of Triple Premium LLLL.coms include: ASDX.com, POSW.com, NWOO.com, XEEB.com. 
Quad Premium: We use this term to refer to LLLL.coms containing four premium letters.Examples of Quad Premium LLLL.coms include: AAAL.com, FFLE.com, MNGO.com, GHPR.com.