The Dev, in this sentence stands for development.
Let´s create a situation here:
You have a Kodak Tri-X 400 and some D76 Developer and you want to know exactly how many minutes you have to bath the film?! Voila – check out:
According to the website (with the ridiculous name – digitaltruth???) this is the world´s largest film development chart.
Besides that you can find even more charts, like a temperature converter from Celsius to Fahrenheit or general guidelines about push processing!
The right page for our lab rats!