الْعِلْمُ نُورٌ
Knowledge is light.
Read as an emphatic simile, both the particle and explicit shared quality are absent: it is a balīgh comparison. By contrast, “Zayd is like a lion” expresses the particle but leaves the point of similarity unstated, so it is mursal and mujmal.
Two independent questions determine these labels: is the comparison particle present, and is the shared quality stated? A single example can receive a label under both dimensions.