Is this a THAI or BURMESE Shield?

[Nathaniel]

Originally Posted by PUFF

Please be noted that the paired Dahb with shields in the museum may not very accurate.

Also terms Loh, Dunk, Kehn are often confused even among Thai people.
Scholars often refer
Loh : any type of shields
Dunk : rectangular shields
Kehn : round shields

Modern Krabi Krabong School often refer
Loh : round shields
Dunk : rectangular shields
Kehn : rectangular shields

...

K.Puff, I do not know very much about use of shields, but do you know if there was one shape of the shield better for certain situations/ certain shape shield used for different unit of the military due to their function/ role?