Some language for the “Card Type” and “Card Material” is confusing, with lots of potential for overlap.  Here is a glossary of some of the terms and how they are used here:

Card Type

Base:  A base card is a normal, basic card that is part of the set.  If a pack comes with 12 cards, those 12 cards are base cards.

Insert:  An insert card is more limited than a base card, maybe 1 per pack or 1 per 12 packs, etc.  As used here, they are frequently part of a subset.

Parallel:  A parallel card is a card with the same image as a base card, but with some variation, for example, with a different colored border, or made from a different material.

Base and Blue Parallel (numbered)

Base and Blue Parallel (numbered)

 

Relic:  A relic card has a piece of jersey or bat or other item embedded into the card.

Bat Relic Card and Jersey Relic Card

Bat Relic Card and Jersey Relic Card

 

Variation:  A variation has the same number as a base card, but a different image.

Base Card and Photo Variation Card

Base Card and Photo Variation Card

 

Short Print:  A short-print card is part of a base set, but with smaller print runs than the normal base cards.

Event:  An event card is one given away at a specific event, such as the National Convention or the All Star Fanfest, or as a stadium-giveaway.

Numbered:  A numbered card is limited to a certain number printed, and includes the specific number of that particular card, so that a card might be limited to 200 made, and the card-in-hand is numbered 148 of 200.

Mini:  A mini-card is smaller than a normal 2.5″ x 3.5″ card.

Tobacco card:  A tobacco card is modeled after tobacco cards from the early part of the 20th century, and are 1 7/16″ x 2 5/8th”.

Base Card and Tobacco Card Variation

Base Card and Tobacco Card Variation

 

Redemption Card:  A redemption card is not available in packs; typically, they are available as part of a wrapper-mail-in promotion.

Box Topper:  A box topper is an over-sized card limited to 1 per box of cards.

Oversized:  Any card larger than 2.5″ x 3.5.”

Card Material

Cardstock:  The common material for cards today, usually thicker and sturdier than cards made pre-1990s, generally with a white core.

Cardboard:  The pre-cardstock material, used for throwback and retro card sets, similar to the cards from the 1980s and earlier.

Acetate:  Cards on, or featuring, acetate plastic.

Paper:  Cards printed on something thinner than cardstock.

Die Cut:  Die cut cards have irregular edges, rather than straight edges.

Die Cut Card

Die Cut Card

 

Chrome:  Cards that have a surface that has reflective properties.

Refractor:  A trade-marked by Topps, this is used more generally here.  They refer to cards that, like chrome cards, are reflective, but that “refract” the colors of a spectrum.  Refractors are much more reflective than chrome cards.

Base Card, Chrome Card, and Refractor Card

Base Card, Chrome Card, and Refractor Card

 

Foil:  A type of reflective card that is thinner and less expensive than chrome or refractor cards.  “Rainbow foil” can be very difficult to differentiate from “refractor” cards.  (Generally, I don’t count cards as “foil” if the base card features foil borders or foil text, as if often the case).

Base Card and Rainbow Foil Card

Base Card and Rainbow Foil Card

 

Depiction

“Depiction” can be somewhat subjective.

“Running” is defined very narrowly as running the bases.  A depiction of Trout standing on a base wouldn’t count as “Running” (as in the chrome/refractor example cards above), and a depiction of him running after a fly ball is classified as “Fielding.”  Running on or off the field is also not defined as “Running,” but is classified as “Candid” (as in the Die Cut Card example above).

“Sliding” is a subcategory of “Running”–all depictions of sliding are also categorized as “Running,” but the reverse is not true.

“Portrait” means any image that is obviously posed.  Any non-posed, but non-action shot (that is, Batting, Running, or Fielding”) falls under the broad category of “Candid.”

“Smiling” means a real smile (no half-smiles).

These terms are NOT mutually exclusive, so a card might be classified as both “Running” and “Smiling,” for instance.  You can enter these terms in a general search to retrieve cards with multiple depictions.