In short: Read the card from its bottom edge, not its artwork. The collector number and set total name the card inside its set, the set symbol names the set, the rarity symbol gives the tier, the regulation letter dates the print, and the illustrator and copyright lines separate two versions of the same card. Those six marks together identify one printing, which is the only thing a price can be attached to.

Six marks turn a name into a printing

Put the card face up and look at the bottom edge first. The artwork tells you the Pokémon. The bottom edge tells you which of the dozens of cards carrying that Pokémon you are actually holding, and that is the fact a price hangs on. A Pikachu is not a price. Pikachu 025/197, in one rarity, by one illustrator, is.

Read the marks in the order below. Each one cuts the field. The collector number does most of the work, the set symbol and rarity symbol confirm it, and the last three settle the cases where two printings look identical at arm's length.

The six marks and what each one rules out
MarkWhere it sitsWhat it rules out
Collector number and set totalBottom edge, printed as 025/197Every other card in the set
Set symbolA small graphic beside the numberEvery other set, reprints included
Rarity symbolBeside the number: circle, diamond, starThe wrong tier of the same card
Regulation markA boxed capital letter near the numberSets outside that block of years
Illustrator creditUnder the artwork, after Illus.The other artwork of the same card
Copyright lineAlong the bottom, with the yearsAny print run before the latest year

The collector number is the card's address

025/197 reads as card 25 of a 197-card set. The left number is the card's slot in the printed order, the right number is how many cards the set was built with, and the pair is what a sold-listing search keys on. Type 025/197 next to the set name and you get that card and very little else.

A left number larger than the set total is the useful exception. 201/197 cannot be a slot in a 197-card run, and that is the point: secret rares are numbered past the end of the set. The set total stays at 197 while the left number runs past it, so the giveaway is always on the left.

Older cards use the same idea with a smaller total. A Base Set card reads 4/102 out of a 102-card run from 1999, and Base Set carries no set symbol at all, so on those cards the number, the copyright line and the 1st Edition stamp do the identifying on their own.

The set symbol names the box the card came out of

The set symbol is the small graphic printed beside the collector number. It is a picture rather than a letter, and on an English card it is the mark that names the expansion. Two sets can both contain a card numbered 025, so the symbol is what stops the number from being ambiguous.

For most of the game's life that block sat in the bottom-right corner. Scarlet & Violet, which launched in 2023, moved the number, the set symbol and the rarity symbol to the bottom left and put a three-letter expansion code beside them. The code is faster to read than the symbol and easier to copy into a search box.

Reprints are where the symbol earns its keep. The same Pokémon, the same artwork and the same rarity can appear in one set and again in a later reprint, with a different symbol and a different number. The two sell at different prices, sometimes by a wide margin.

The rarity symbol and the regulation letter answer different questions

The rarity symbol is a circle, a diamond, a star, or one of the modern multi-star marks, and it says which tier the card was printed at. It is a separate fact from the set symbol sitting next to it, and a separate fact from the holo finish on the surface. The full ladder, gold-star tiers included, is its own subject.

The regulation mark is a single capital letter in a small box near the collector number, and it dates the card. The Standard format is administered with those letters: it allows only recent cards, back to a cut-off point, and the rotation moves that cut-off roughly once a year. Main expansions become legal two weeks after their booster products are released.

For a collector the letter is a shortcut. It drops the card into a block of a few years with no set name needed, which separates a 2019 print from a 2024 one at a glance. A card with no regulation mark at all is older than the system, and that absence is itself a date.

Sources: Bulbapedia: Standard format (TCG)

The top half of the card is the game, not the identity

HP in the top right, the type symbol beside it, the stage and evolution box above the name, then weakness, resistance and retreat cost in the strip below the attacks. All of it matters at a table. None of it identifies a printing, because those numbers are copied across every reprint of the card.

One exception is worth holding on to. Where two cards share a name but not a stat line, the stat line dates them, since an older print of the same Pokémon usually carries less HP and cheaper attacks than a recent one. Treat that as a tiebreaker. The answer is still on the bottom edge.

One Pokémon, two numbers, two unrelated prices

Take the card numbered 025/197. Card 25 of 197, with the set symbol and the three-letter code beside the number, one black star for rare, and one name under the artwork. That is a single printing, and it is the only thing worth pricing.

The same Pokémon from the same set also exists as a secret rare numbered 201/197. 197 + 4 = 201, so it is the fourth card printed past the end of the set. It carries a different rarity mark, sits in a different place in the pull rates, and on many secret rares it carries a different illustrator too. Same name, same set, different card.

Price them separately. Search sold listings for the exact string 025/197 with the set name, take the last ten sales and read the middle of them. Do the same for 201/197. The two middles are not related to each other, and no ratio between them carries from one set to the next. A price taken off the wrong one of those two lines is not slightly wrong. It is the price of a different card.

The rarity symbol gives you the tier, not the price

Two cards from the same set with the same rarity symbol can sit a dollar apart or a hundred apart. The symbol counts how the card was seeded into packs. It does not count how many people want that particular Pokémon, whether the artwork became the one everybody chased, or how many copies went into graded holders and left the raw market for good.

So the number is the thing to search on and the symbol is not. Two sold listings of the same printing will also disagree, because one was an auction that closed on a Tuesday morning and one was a fixed-price listing from a seller with long feedback. The middle of ten sales of one exact printing is a usable number. A tier on its own is a category.

Read all six from a photo

Six marks by eye is about a minute a card, and it gets slower as the print gets smaller and the pile gets taller. CardLens matches the exact printing from a photo, with the set, collector number, rarity, finish and language read together, and shows a value range built on recent eBay sales of that printing. The sales behind the range are visible in the app, one tap below the number.

Photograph the card flat with the light off to one side so the bottom edge stays readable, and the match lands on the right line of the catalog. Save the card and the vault total updates.

Questions collectors ask

What do the numbers on the bottom of a Pokémon card mean?

The left number is the slot the card holds, the right one is how many cards the main run contains. Together they work as an address. One Pokémon holds a different address in every set it has appeared in, and each address has its own price.

Why is my Pokémon card number higher than the set total?

Secret rares are numbered past the end of the run, and the printed total does not move when they are added. A card reading 201 out of 197 is the fourth one past the end. Search on the number it carries, not on the set size.

What does the letter in the small box on a Pokémon card mean?

It is the regulation mark, and tournament legality is administered by it. The cut-off moves roughly once a year, so the letter narrows the card to a short window of printing years. No letter at all means the card is older than the system.

How can I tell which set a Pokémon card is from?

Read the set symbol beside the collector number, and on Scarlet & Violet cards the three-letter expansion code next to it. Base Set and some early promos carry no symbol, so those are placed by the collector number and the copyright line instead.

How do I know how rare a Pokémon card is?

The rarity symbol beside the collector number gives the tier: a circle for common, a diamond for uncommon, a star for rare, and multi-star marks for the modern premium tiers. The tier is not a price. Two cards with the same symbol can sit a dollar apart.

Free on the App Store

Point the camera at the bottom edge and let it read the printing.

CardLens names the set, collector number, rarity and language from one photo and shows a value range with recent eBay sales behind it. Free on the App Store, with an optional premium subscription.