A half lap joint usually consist of two members notched to half thickness and lapped on each other with the face flush.

 

Angled cross half-lap joint
Angled T half-lap joint
Beveled T half-lap joint
Blind half-lap joint
Blind half-lap miter joint
Carpentry tie half-lap joint
Corner half-lap joint
Corner half-lap joint with double dovetails
Cross dovetailed half-lap joint
Cross half-lap joint
Cross half-lap joint with housed corners
Cross half-lap joint with one side dovetailed
Cross rail and upright halved joint
Cross rail and upright mitered and halved joint
Dovetail half-lap joint
Dovetail half-lap joint with shoulder
Dovetailed brace joint
Edge half-lap joint
End half-lap joint for circular work
Full lap joint
Glazing bar half-lap joint
Half-lap joint with one side dovetailed
Half-lap scarf joint
Halved joint on barrow wheels
Halved moulded joint
Interlocking cross half-lap joint
Keyed dovetail half-lap joint
Mitered half-lap joint
Notched overlap lap joint
Oblique half-lap joint with shoulder
Overlap lap joint
Stopped dovetail half-lap joint
Stopped half-lap joint with one side dovetailed
T half-lap joint
Three member half-lap joint

Half lap joint terminology

Half lap joint terminology