This simple notation written as n/m/F/Fmax means flow shop scheduling: to minimize the maximum makespan or flow time with m machines and n jobs.
n is used to denote a number of job-arrival processes;
m means the number of machines in the given scheduling problem;
F is used in flow shop scheduling, or the flow pattern of jobs through machines used in the shop;
Fmax refers to the criterion for determining a schedule of jobs.