orthogonal balanced block designs
group balanced block design
pairwise balanced block design
partially balanced arrays
self-orthogonal block code
orthogonal arrays design
orthogonal arrays experimental design
Orthogonal arrays testing method
block and block [= chocka-block
2 atrioventricular block and complete atrioventricular block
BDCB Block Device Control Block
Block 36 and Block 38 in Oman
block by block relaxation operator
block by block transfer
block gage (gage block) (slip gage)
Block Xia 502 and Block Xia 509