Example below. UniFormat groups construction by functional element (what part of the building) rather than by trade. Useful for elemental cost planning. Press / to focus the search box.
A Substructure  ›  A10 Foundations  ›  A1030 Slab on Grade
A1030

Slab on Grade

INDIVIDUAL ELEMENT · LEVEL 3

How the code is structured

A
Major Group
(Substructure)
10
Group Element
(Foundations)
30
Individual Element
(Slab on Grade)

Sub-elements add a final digit (e.g. A1031 — Standard Slab on Grade).

Sub-elements under A1030

A1031   Standard Slab on Grade
A1032   Structural Slab on Grade
A1033   Inclined Slab on Grade
A1034   Trenches, Pits & Bases
A1035   Under-Slab Drainage & Insulation

The 7 UniFormat major groups

A   Substructure · foundations & basements
B   Shell · superstructure, exterior, roof
C   Interiors · partitions, finishes, doors
D   Services · HVAC, plumbing, electrical
E   Equipment & Furnishings
F   Special Construction & Demolition
G   Building Sitework · site prep, services, paving
Pick any element from the tree on the left to view it the same way. UniFormat is the basis of elemental cost planning — cost-planners and QS firms group estimates by these elements early in design when trade-level breakdowns aren't available yet.