It could be anything, you haven't given anywhere near enough information to be able to help.
![](./images/smilies/spacer.gif)
Is it happening when the car is stood still and engine running? Or when driving? If so at what speed? When driven over bumps? A rotational noise in time with the wheel speed? During braking?
![](./images/smilies/spacer.gif)
The more info you give the easier it will be for someone to help, but
![](./images/smilies/spacer.gif)
"The sound is coming from rear left.
![](./images/smilies/spacer.gif)
It's like metallic sound and you can hear it more when car is warmed up".
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
.
![](./images/smilies/spacer.gif)
could be absolutely anything.
![](./images/smilies/spacer.gif)