Half-drop
Half-drop patterns are made by dropping every second line of motifs down a half-length height of the motif.

Decorative tile, Topkapi Palace museum, Istanbul, Turkey, Efrain Padro / Alamy Stock Photo
These tiles from the Topkapi Palace in Istambul are arranged in a half-drop repeat.
The leaf-shaped motif is arranged so that alternate columns are staggered vertically by half the height of the motif.
The pattern is regular but feels more varied than a block repeat.

Decorative tile, Topkapi Palace museum, Istanbul, Turkey, Efrain Padro / Alamy Stock Photo