06
Printed set identifier

SET ID

Every shipped card carries a stable player-facing identifier printed on the card footer. It encodes card type, season, and sequence number.

Format

The printed ID follows the pattern TYPE-SEASON-NNN (e.g. RK-S1-023, US-S1-007). The three segments are:

  • TYPE— two-letter code derived from the card's genre or territory (see below).
  • SEASON — season code (S1 for Era I). All current cards use S1.
  • NNN — zero-padded sequence number within the season (001–180). Optionally followed by a variant suffix (e.g. 023b).
Song cards — TYPE code

The TYPE code comes from the card's root genre or territory:

  • Genre-only cards use the root genre code: RK Rock, MS Mainstream, EL Electronic, RD Reggae/Dub, HH Hip-Hop, DF Disco/Funk, CS Classical, VT Vintage.
  • World cards (country or region) use the territory's ISO 3166-1 alpha-2 code (e.g. US, FR, DE). Sub-national regions use the ISO private-use X-prefix convention (e.g. XB Britany, XS Scotland).
  • World+genre cards use the territory code — the genre is captured in the genre strip, not the Set ID.
Transition cards — TYPE code

Transition cards are assigned the TYPE code of their transition pillar genre — the root genre on the taxonomy wheel that anchors the bridge. The code is looked up from Genre.printedTypeCode stored in the database (same two-letter codes as song-card genres above).