"A picture is worth a thousand words"
In the project I'm currently working I have the designer roll, and by designer I mean to mechanics and not art, so in the process of writing ideas such as the main features of a character or an enemy, the layout of a room or dungeon etc... I think that a quick sketch would be more clear than four paragraphs of text, but, I know nothing about drawing or sketching and I cant find anything that is not art-related.
What is the name of the technique used to illustrate this concepts?
To be more specific I looking for the technique that allow me to explain design concepts by drawing them, in the case of a character it would be something like a stickman with the key details.
Finally to not run in opinion based or to abroad issues I just want the name of the technique or a way to google it, (I'm assuming that there is not a ton different valid technics or they can be merged in a group)