+90d denotes a ninety-day interval, a quarter of a year. This period often serves as a key [Transition Point](/wiki/transition_point) or a framework for [Short-term Goals](/wiki/short-term_goals) across various disciplines. It frequently marks a cycle for evaluation or a defined challenge.
+## See also
+- [Time Management](/wiki/time_management)
+- [Project Planning](/wiki/project_planning)
+- [Milestone](/wiki/milestone)
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