This article is from the RSC/UKSC Cricket FAQ, by Ganesh with numerous contributions by others.
When a batsman takes his usual side-on stance, the side
towards his legs is his strong side and is called the "on"
side or leg side of the field. The other side is called
the "off" side.
For a Right Handed Batsman(RHB)
----- | | | stance of a right-hander | | | / offside<----| | | / | ||| |/ | || | --->legside --' --' or onside
------- | | | stance of a left-hander | | | / | | |---/-------->offside | | || | / legside<-------| | / or onside `-- `--
 
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