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A term used in symplectic and contact geometry. In the case of a [[Symplectic manifold|symplectic manifold]] $( M ^ { 2 n } , \omega )$, where $\omega$ is a closed, non-degenerate $2$-form, it denotes a submanifold $L$ of $M$ such that $\omega$ restricts to zero on the tangent bundle of $L$. In the case of a contact manifold $( M ^ { 2 n + 1 } , \xi )$, where locally $\xi = \operatorname{ker} \alpha$ with a $1$-form $\alpha$ satisfying $\alpha \wedge ( d \alpha ) ^ { n } \neq 0$, it refers to a submanifold which is everywhere tangent to $\xi $. In either case an isotropic submanifold is of dimension at most $n$. An isotropic submanifold of maximal dimension $n$ is called a Lagrange submanifold in the former case, and a Legendre submanifold in the latter.

====References====
<table><tr><td valign="top">[a1]</td> <td valign="top">  V.I. Arnold,   A.B. Givental,   "Symplectic geometry"  V.I. Arnold (ed.)  S.P. Novikov (ed.) , ''Dynamical Systems IV'' , ''Encycl. Math. Sci.'' , '''4''' , Springer  (1990)</td></tr></table>