The phrase "Allahu Akbar" (الله أكبر) translates to "Allah is the Greatest." It is a fundamental expression in Islam, a core part of the Adhan (call to prayer), and is also used in various other contexts. The search results from sunnah.com show its presence in the final words of the Adhan and within supplications, indicating its significance in Islamic practice. This emphasizes its role in declarations of faith and glorification of God. The phrase is often repeated to amplify its meaning and impact. Furthermore, sunnah.com provides access to Hadith, which offer further explanation and context about the use of this phrase.