What to call elements next to each other in a finite subset of an infinite set?

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Assume I have a finite subset $D$ of $\mathbb{Q}$. Does anyone know a name for the property of two elements $e_1, e_2 \in D$ having $\lnot \exists e_3\in D: e_1 < e_3 < e_2 $?

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In this case $e_2$ is said to cover $e_1$. See also wikipedia