How you like your steak is very subjective and in a professional kitchen, you often get cooking descriptions that can be convoluted and incredibly detailed. Chefs gauge the thickness and weight of the piece of meat, the type of cut, the cooking technique and the provenance of beef when cooking and often access the stages by gently touching and feeling the give in the meat and using their experience as a guide. A good grill chef is a very valuable member of the kitchen.
The Online Cookery School 