The technical term for this week: truss

  Truss is a term used in structural engineering that uses triangular shapes and knots (triangle vertex) to make the structure more stable, in addition to being lighter structures they are made so that all force on the lattice is placed on top of these nodes so eliminating bending and twisting efforts.

Source: repositorio.roca.utfpr.edu.br/jspui/bitstream/1/7341/1/PB_DAMEC_2016_2_29.pdf

Source: br.pinterest.com/pin/296111744230072285/?lp=true