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Basics
The Gotei 13. Is split into thirteen divisions each division is specialized in a certain expertise:
4th Division is the medical/supply division,
9th Division newspaper and magazine-related duties
11th Division is the combat division (specialization in swordsmanship)
12th Division is the research/scientific division.

Insigna
Each of the 13 divisions have their own symbol that represents the division's primary role, which all seem to be based on flowers. When a power limit is placed on a captain or lieutenant, their symbol appears on a certain part of their body until the limit is lifted. Each symbol also has a specific meaning:

•The 1st Division Flower: Chrysanthemum- Truth and Innocence.
•The 2nd Division Flower: Tulip- Seek nothing.
•The 3rd Division Flower: Marigold- Despair.
•The 4th Division Flower: Bellflower- Those who grieve are loved.
•The 5th Division Flower: Lily-of-the-Valley- Sacrifice, Danger, Pure love.
•The 6th Division Flower: Camellia- Noble reason.
•The 7th Division Flower: Iris- Courage.
•The 8th Division Flower: Bird of Paradise flower- Everything is obtained.
•The 9th Division Flower: Buttercup- Oblivion.
•The 10th Division Flower: Daffodil- Mystery, Egoism.
•The 11th Division Flower: Yarrow- Fight.
•The 12th Division Flower: Thistle- Vengeance, Strictness, Independence.
•The 13th Division Flower: Summer Snowflake- Hope.