determine "text domain" name for a plugin

hi,
how do i know exactly what name to enter for "in this text domain" for a particular plugin ?

i have simply asked here in the past regarding wpmudev plugins but i would like to know for future reference on my own for other plugins.

i was thinking that it would be the name of the pot file in the languages folder of the plugin but if my memory serves me right i remember comparing this to a recommended "text domain" name i got from these forums and it did not match.

basically i want to change the word "review" which obviously is a common name so i want to make sure it is changed in the plugin alone ; which to my understanding is what "in this text domain" is for.

specifically the plugin is "Sabai Directory" from theme forest.

any kind assistance in this would be greatly appreciated.

kind regards.