Why It Exists
Sequence numbers give every Tau card a stable position in the full 150-card deck. The numbers are useful as label by themselves, but have additional grouping properties.
10 groups
Sequence Numbers
Sequence numbers provide a 000-149 identifier for every card in the top right.
Uses in Play
Use the sequence number whenever each card needs a unique identifier, sortable value, or score.
Use the last digit to group cards within suit colors: each color contains three cards ending in each digit. Tarot numbering provides another way to identify and order the marked cards.
Relationships
For ranks 1-10, the sequence numbers follow a predictable 000-099 ordering, where the first 2 digits match the suit and the last digit is the rank. Rank 10 is assigned 0.
Ranks 11-15 are assigned 100-149, the end result giving 3 last-digit matches per suit color.
The Tarot cards have sequence numbers ending in 00-24 (indicated with a T), which match the canonical Tarot numbering.