Mattel estimate that there are well more than 100,000 avid Barbie collectors worldwide. Ninety percent are women, at the usual age of 40, they purchase more than 20 Barbie dolls every year.

The Barbie Girl 

Collector Edition - Dolls designed specifically for collectors aged 14 and over. Collector Edition dolls usually come in showcase packaging, with a stand and a certificate of authenticity.

Customized - Dolls designed exclusively for specific retail stores are referred to as "customized".

Limited Edition - Collector Edition dolls produced in limited quantities worldwide, which are often available only from specific retailers. These dolls generally feature higher-quality materials and construction than non-limited dolls.

OSS - Stands for "original swimsuit". Denotes a doll that is still dressed in the swimsuit it originally came in.

Ponytail - Barbie's first hairstyle consisted of a top-knot ponytail with tightly-curled bangs. Dolls with this hairstyle are referred to by collectors as the "ponytail" dolls. Early Barbie dolls are organized into five major groups based on various physical characterstics that can be used to determine when a particular doll was manufactured. The major categories are denoted by numbers.

Timeless Treasures™ - A Collector Edition line featuring celebrity and character dolls.

TNT - "Twist 'N Turn" Waist. A waist with a rotational joint, originally introduced in 1967, copyrighted in 1966. Many variations of this original design have been used.

Vintage - Dolls produced through 1972 are generally considered to be "vintage."

Modern - Dolls produced after 1972.

NRFB - Stands for "Never Removed From Box." Indicates that a doll is undisturbed in its original, un-opened packaging.

MIB - Stands for "Mint in Box." Indicates that a doll is in perfect, like-new condition, and is still housed in its original box, but the box has been opened and the doll may have been removed at some point.

A/O - "All original." Indicates that a doll is exactly as it was when it was originally left the factory, with no restoration work having been done to it.

M/C - "Mint and complete." An outfit in perfect, just-out-of-the box condition with all pieces and accessories included.

OOAK - "One of a kind." A doll that has been customized by an artist, usually by repainting and/or rerooting the hair.