1. Piconet:

A collection of devices connected via Bluetooth technology in an ad hoc fashion.

A piconet starts with two connected devices, such as a PC and cellular phone, and may grow to eight connected devices. All Bluetooth devices are peer units and have identical implementations.

However, when establishing a piconet, one unit will act as a master for synchronization purposes, and the other(s) as slave(s) for the duration of the piconet connection.

2. Scatternet:

Two or more independent and nonsynchronized piconets that communicate with each other. A slave as well as a master unit in one piconet can establish this connection by becoming a slave in the other piconet.

3. Master unit: The device in the piconet whose clock and hopping sequence are used to synchronize all other devices in the piconet.

4. Slave units: All devices in a piconet that are not the master (up to seven active units for each master).

5. MAC address: A 3-bit medium access control address used to distinguish between units participating in the piconet.

6. Parked units: Devices in a piconet which are time-synchronized but do not have MAC addresses.

7. Sniff and hold mode: Devices that are synchronized to a piconet, and which have temporarily entered power-saving mode in which device activity is reduced.

Bluetooth is an open standard that provides an Adhoc way for connecting devices in 10 M range. Fallowing Different terms used in Bluetooth.
a) Slave (S): it is a device connected in a configuration with master.max seven number slaves are connected in a configuration (Piconet)
b) Master(M): it is a device connected in a configuration with slave .one master is connected in a configuration (Piconet)
c) Piconet(P): it is a collection of devices via Bluetooth technology in an adhoc fashion. It consists of eight devises .one will be master reaming seven are slaves. Each slave responds to master device. (Full Duplex Communication).

d) Scatternet: Combination of Two or More Piconets form a Scatternet Normally 10 Piconets are allowed in Scatternet.A slave as well as a master in one piconet can become a slave in other piconet.
e)MAC address: A 3-bit medium access control address used to distinguish between units participating in the piconet.
f) Parked units. Devices in a piconet which are time-synchronized but do not have MAC addresses.
g)Sniff and hold mode. Devices that are synchronized to a piconet, and which have temporarily entered power-saving mode in which device activity is reduced.