Periodic block

block matrix

block-matrix

bordered block diagonal

slab matrix block

an diagonal matrix

Diagonal Matrix

triple diagonal matrix

2 atrioventricular block and complete atrioventricular block

Block 36 and Block 38 in Oman

Block Xia 502 and Block Xia 509

AC three phase three wire insulated system

AC three phase three wire system with earthed hull as neutral wire

three steps and three postures and nine practices

Three yang and three yin

Three yin and Three yang

1D periodic dielectric material

1-periodic

2(n)-periodic

2-periodic