Transformer core

[Shadow_warrior]

Can anyone tell what D E F G means in the figure below?

 

[ronsimpson]

https://www.mhw-intl.com
From there you can look at TDK or other companies.

 

[unclejed613]

Can anyone tell what D E F G means in the figure below?

if you posted the rest of the drawing, i could tell you. D,E,F, and G should be called out in the drawing with arrows and lines showing which dimension it is. something like this:

|<------------D------------->|