This is a Russian word meaning 'independent' or 'self-contained'. In the context of a school setting, it often refers to independent work or tasks.
This appears to be a label or heading from a school notebook. The word 'Самостоятель' is Russian and translates to 'independent' or 'self-contained'. In an educational context, it typically precedes tasks that students are expected to complete on their own, such as independent work, practice problems, or a test.
Without further context from the surrounding text or a clearer image, it's difficult to determine the exact nature of the 'independent' task, but it is clearly an educational or organizational label.