Every person at least once in a Hollywood movie or in photographs should have seen the mysterious arrows on the sides of American tanks. As you might guess, all the symbols printed on the surface of the combat vehicle body are its tactical markings and serve to identify a piece of equipment in a combat situation.
Tactical marking is not a thing that is not usually deciphered to be told at every corner. This information, frankly speaking, is not that secret. However, it is usually not dumped into the wider public field. Numerous numbers and symbols on American vehicles (as well as on military vehicles of any other countries and blocs) are used to identify the vehicle by its belonging to a particular formation. Since any army has a strict hierarchy and structure of units, a clear system of designations and numbers is extremely important.
Each vehicle, unit of weapons and equipment, as well as each fighter, has its own serial number. Many combat vehicles also have some sort of insignia. But they do not indicate the rank, but the belonging, for example, of tanks to one or another unit.
The grassroots tactical formation of American troops is battalions. They are mixed, armored and motorized rifle. American battalions are made up of companies, and companies are made up of platoons and squads. So in peacetime, the US battalion has three companies. In wartime, the number of mouths can be increased to five. This system works more or less equally in relation to both armored and motorized rifle formations.
Actually, the aforementioned "mysterious arrows" or "corners" are part of the tactical markings, which indicate that the combat vehicle belongs to a certain company within the battalion. We need this symbolism mainly for the command. It is noteworthy that the designations-arrows for numbering the mouths are used not only in NATO, but also among its allies. Including similar symbols are used in the armored forces of Israel.
If you find out even more interesting things, then you should read about why are they installed on NATO tanks so elongated towers.