The term 'KIND OF PORT' can refer to several different types of ports. A modem (5 letters) is a device that allows computers to connect to the internet or other networks. A USB (3 letters) port is a type of port used to connect external devices to a computer. A HELI (4 letters) port is a type of port used to connect helicopters to a ground station. Finally, a TREATY (6 letters) port is a type of port used to facilitate international trade agreements.