clear proof / evidence / definitive argument
Masculine noun. Quadriliteral root. Plural: بَرَاهِينُ (barāhīn). Refers to the strongest kind of proof - irrefutable evidence. The Quran itself is called a burhān.
The Quran demands burhān (proof) - 'bring your proof if you are truthful' (2:111). Islam encourages evidence-based conviction, not blind faith.