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Vogan diagram 
Summary
In mathematics, a Vogan diagram, named after David Vogan, is a variation of the Dynkin diagram of a real semisimple Lie algebra that indicates the maximal compact subgroup. Although they resemble Satake diagrams they are a different way of classifying simple Lie algebras.
References edit
- Knapp, Anthony W. (2002), Lie groups beyond an introduction, Progress in Mathematics, vol. 140 (2nd ed.), Boston, MA: Birkhäuser Boston, ISBN 978-0-8176-4259-4, MR 1920389