Any form of shift work where there are semi-regular work hours. In some cases, workers may work three different shifts in a work week. In all the various types of shifts, there is usually a break of several hour between the reporting times of the workers.
Split shift, is an employment schedule, a type of Shift work where a person's normal work day is split in to 2 or more segments, for example a person may work from 5 a.m. to 9 a.m. and then have a break until 3 p.m. at which point they might return to work until 7 p.m.. This is especially common for public transport employees where it is advantageous to have additional staff working during traditional rush hour times.