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In mathematics, particularly category theory, a 2-group is a groupoid with a way to multiply objects and morphisms, making it resemble a group. They are part of a larger hierarchy of n-groups.
They were introduced by Hoàng Xuân Sính in the late 1960s under the name gr-categories, and they are also known as categorical groups.
This topic has recently gained attention due to increased public interest. Search activity and Wikipedia pageviews suggest growing global engagement.
Search interest data over the past 12 months indicates that this topic periodically attracts global attention. Sudden spikes often correlate with major news events, public statements, or geopolitical developments.