10Base2?An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling, with a contiguous cable segment length of 100 meters and a maximum of 2 segments.
10Base5?An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling, with 5 continuous segments not exceeding 100 meters per segment.
10BaseT?An Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling and twisted pair cabling.
All these 3 are related to ethernet cables, where 10base2 can define as maximum rate of data tranfer is 10megabits per second ,B standa for baseband signaling and 2 is for 200 meter of lenght... this is same for 10base5 but where in 10baset T stands for twisted pair of cable