What is $D_{5}$

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I have recently encountered a Lie group in a paper called $D_{5}$ as a subgroup of $E_{6}$. I have tried googling with mixed results. Is it just $\operatorname{SO}_{10}(\mathbb C)$?. Is it $\operatorname{Spin}(10)$? I am looking for geometric information and I am approaching this material from the realm of homogeneous spaces and symmetric spaces, if it makes a difference.