Problem with & in SQL*PLUS

In my 'Insert' statement, I have the data value like 'R & D'. When run with SQL*PLUS, it paused me to enter the new value. Can anyone tell me how to temporarily disable the interpretation of & in sqlplus and enable it back after the executive of the script?

Thanks in advance.

                     '"'
                    (_at_ @)
 ----------------ooO-(_)-Ooo-------------------+--------------------- 


| Kenneth YUEN  | itkennet_at_smtpgwy.polyu.edu.hk|Phone:(852)2766-5370 |

| The H.K. PolyU| HungHom, Kln., Hong Kong.    |  Fax:(852)2356-7918 |


|               | http://www.polyu.edu.hk      |                     |


 ---------------+------------------------------+---------------------