What do we say a thing in English which we use to catch a hot dish?

[DawoodUsmani]

A small device made of steel used to handle hot cooking utensils.
A small device made of steel used to handle hot cooking utensils just like a pair of scissors.

 

[nikki]

I think the word you are looking for is pot-holder. As in a padded, usually square, piece of fabric that you use to grab hot pots, plates or dishes.