The term restricted and repetitive behaviours is used in the DSM-5 when outlining the diagnostic criteria for autism.

Autistic people display a range of actions and activities, including:

• repetitive sensory-motor behaviours, such as spinning in circles or flicking light switches;
• finds enjoyment and comfort in sameness;
• engage in self-injurious behaviours, such as nail biting or skin picking;
• have preferred sensory preferences, such as preferring certain fabrics or have a strong dislike for other sensory preferences such as certain smells;
• detailed interests, such as having a fascination with a specific number;
• have strong preferences for the way things are done, or the order in which they are done:
• use language in a repetitive manner;
• have a particular focussed interest, often acquiring extensive knowledge and expertise in.

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