The Types of Ijmāʿ
Answer
In essence, ijmāʿ is of three types: 1) ijmāʿ qawlī (verbal);2) ijmāʿ ʿamalī (practical);3) ijmāʿ sukūtī (tacit). A brief explanation of each of these three types follows. (1) Ijmāʿ qawlī is when all those qualified to form ijmāʿ verbally express their unanimous agreement on some religious matter; for example, all the Companions gave the oath of allegiance (bayʿah)
Source: Fatawa Mahmudiyya
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