Gearwheels have teeth that are arranged circularly around a centre at regular intervals. These gears can be combined with each other. In this way, larger and smaller gears can be connected to each other and transmit movement. For example, in a watch: if you turn the crown on a wristwatch, the hands move. Behind this is a complicated system of many cogwheels of different sizes that interlock and make this possible. In this context, there is the rather negatively connoted saying that someone is only a cog in a system. What is meant is that one is lost in the masses and is insignificant. I think that is wrong. If only one cog in a gearwheel system is defective or one tooth is missing, the whole system no longer functions. So see yourself - no matter how insignificant you think you are - as special for being such a cog in a social structure. You count.
I wish you an extraordinary day!