Castellated beam

A castellated beam is a beam style where an I-beam is subjected to a longitudinal cut along its web following a specific pattern.
The purpose is to divide and reassemble the beam with a deeper web by taking advantage of the cutting pattern.
References.
Tsavdaridis, Konstantinos Daniel; Kingman, James; Toropov, Vassilli (31 July 2014). "Application of structural topology optimisation to perforated steel beams". Computers and Structures. 158: 108–123. doi:10.1016/j.compstruc.2015.05.004.