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The term banun (lit., "children" or "sons") is often used in the Qur'an metonymically, denoting "popular support" or "many adherents"; in conjunction with the term mal ("worldly goods") it is meant to illustrate a certain mentality which attributes a pseudo-religious significance to wealth and influence, and regards these visible signs of worldly success as a post-factum evidence of the "righteousness" of the person concerned and, hence, of his not being in need of further guidance.
Allah's Signs, by which He calls us, are everywhere-in nature and in our very heart and soul. In Revelation, every verse is a Sign, for it stands symbolically for far more than it says. "Sign" (Ayat) thus becomes a technical term for a verse of the Qur-an.
Cf. vi. 25.