On Land

Environment Information
At Rill Architects we run ArchiCAD on macOS. If you work at Rill, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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Alphabetical by name of thing. Please suggest improvements and additions. Many things have changed, many have stayed the same. Layer theory hasn't changed much. Current as of 16, and I'm not anticipating big differences in 17.

Big table below the fold.

Item Layer Note
Area Calculation Fill Z Measurement
Baseboard F Trim Int Lo
Bathtub P Fixture
Beam, Structural S Beam To display in 3D
Beam, Structural S Framing To display in Structure Plan only
Bench A Cabs2
Bookshelves A Cabs2
Bracket F Trim Int/Ext Hi/Mid
Builtins A Cabs2
Builtin Labels ("Bench") +A Arch Note Reg Scale
Cabinet A Cabs2 Plan and 3D
Cabinet A Cabs3 3D Only
Car; Plan F Furniture
Ceiling A Ceiling3
Centerline Object +A Arch Note Reg Scale To display in Plan, otherwise ! Non-Print
Centerpoint Object ! Non-Print
Chimney Cap A Roof2 or A Fireplace
Chimney Parts A Fireplace Plan and 3D
Chimney Parts A Chimney 3D Only
Clip Line (Ceiling) A Ceiling2
Closet Shelf A Cabs2
Coffer Beams A Soffit2 Use a dotted line for the beam or slab.
Column, Decorative F Trim Int/Ext Mid 3D Only
Column, Decorative A Wall Int/Ext Plan and 3D
Column, Structural S Column Plan, 3D, and Structure
Concrete Slab S Slab 3D Only
Cooktop A Appl
Countertop A Cabs2
Crown Moulding F Trim Int/Ext Hi 3D Only
Crown Moulding (RCP) F Trim Crown 3D, RCP
Cutline, Stair A Stair2 Use object's cutline feature
Deck Railing A Deck2
Deck Railing A Deck Railing To hide in Structure Plan
Deck Structure S Deck
Deck Surface A Deck2 Plan and 3D
Deck Surface A Deck3 3D Only
Detail Marker Note layer of drawing type
Drawing Area (Object) +Z Drawing Area
Drawing in Layout +Z Layout Don't hide them by accident
Plan Title Note layer of drawing type Only plans have title objects in the window
Driveway Mesh or 2D L Drive2
Driveway (Mesh) L Drive3 3D Only
Elec Fixtures
Complicated.
Elec Fixture Symbols, Wall & Floor E Fixt2 Elec Plan
Elec Fixtures, Wall & Floor E Fixt3 Elec Plan, Int Elev
Elec Fixture Symbols, Ceiling E Fixt Clg2 Elec Plan, RCP
Elec Fixtures, Ceiling E Fixt Clg3 Elec Plan, RCP, Int Elev
Elec Fixtures, Exterior, modeled E Fixt Ext3 Elec Plan, Elevations
Elec Fixtures, Ext, Clg, modeled E Fixt Ext Clg3 Elec Plan, RCP, 1/4" Elev
Elevator A Wall Int
Energy Calculation Fill xRef Measurement
Firebox A Fireplace
Floor joist deck S Deck
Floor Pattern F Floor Fin2 Fills
Flooring, Finish F Floor Fin3 3D Only
Chimney Flue Parts A Flue
Footing S Footing Use a dotted line for the slab.
Foundation Perimeter on Site Plan +C Footprint
Foundation Walls & Piers S Wall2 Plan and 3D
Foundation Walls & Piers S Wall3 3D Only
Furniture F Furniture
Gutter F Gutter
Hearth A Cabs2
Hotspot (Drawing Aid) ! Non-Print Not needed, use sparingly, reconsider.
Hotspot (Plan Alignment) Archicad Layer
Hotspot (Other Alignment) Note layer of drawing type
House on Site Plan +L House Line Or use Top View drawing
Int Elev Marker +Z IE Hide, +Z IE Print
Joists, 2D Fill +S Framing
Joists, Modeled S Framing3 S2 Model only, optional
Label for note Note layer of drawing type
Mask Fills, Sect/Elev +A Misc Line
Mech Equipment M Equip Plan, Mech Plan, 3D
Mechanical Fixtures M Fixt Mech Plan, 3D
Mechanical Fixtures M Fixt Clg Mech Plan, 3D, RCP
Mechanical Fixtures +M Elec Note Mech Plan only
Non-Print 2D elements ! Non-Print
Note Leader Note layer of drawing type
Note Text Note layer of drawing type
Object Resources xRef Object Lab Slabifying slabs, e.g.
Oven, wall A Cabs3 The oven itself. The cabinet goes on Cabs2.
Oven, wall A Appl Plan and 3D
Ceiling line object A Ceiling All
Panels F Trim Int/Ext Mid Thin wall with panel windows
Panels, in slabs/roofs F Trim Int/Ext Hi 3D Only
Panels, in slabs/roofs F Trim Crown 3D, RCP
Patches Layer of patched elements In Sect/Elev, use +A Misc Line
Picture (Scanned) Z Image Scan
Pool A Deck2
Radiator M Equip AC Library has a good one
Refrigerator A Appl
Roof Overhead (dotted) A Soffit2 Or Ceiling Line object on A Ceiling All
Roof Plan Fills F Floor Fin2 Rare; use roof  cover fills
Roof A Roof2 Plan and 3D
Roof A Roof3 3D Only
Roof, Cutting X Cutting Roof
Room Name Object +Z Zones Use zones instead
Section Marker +Z SE Hide, +Z SE Print
Shower Head P Fixture
Shower Pan P Fixture
Sink P Fixture
Site (Mesh) L Grade
Site (Mesh), original L Grade.E Optional backup of site data
Site Boundary +L Site Line.E
Site Contour (Existing) +L Contour.E
Site Contour (Modified) +L Contour
Site Contour Labels +L Site Note
Site Cutting slabs etc. X Site Cutting
Soffit, Exterior A Soffit3
Solid Elements Operators X SEO Operator
Stair Arrow +A Arch Note Reg Scale
Stair Newel A Stair2
Stair Railing A Stair Railing To hide in Structure Plan
Stair Stringer (Wall, Object) A Stair3
Stair Tread (Slab, Roof, Object) A Stair3
Switch Path (Electrical) +E Elec Note
Title Block (Object) +Z Layout In worksheet window
Toilet P Fixture
Tree, Model L Tree3
Tree, Symbol L Tree2
Tree, Symbol, Removed L Tree2.D
Vanity Top A Cabs2
Wainscot F Trim Int Lo/Mid
Wall Poche Mask +A Wall Mask
Washer/Dryer A Appl
Zone +Z Zones