Linked from
The 17 pages that link to Maya numerals, each with the reason it gives.
ZeroRelated: Maya mathematics independently used zero in positional notation and calendar records.
Maya calendarRelated: Maya inscriptions use this notation to express calendar counts.
Maya Long Count calendarRelated: Its bars, dots, and zero encode the Long Count’s period values.
Dresden CodexRelated: These symbols express the counts and intervals in the codex’s tables.