Provo, Utah. Y Mountain. The Wasatch Mountain Range That Rises Very Rapidly From The East Edge Of The City. The 'Y' On The Side Of The Mountain Stands For "Young" Or Brigham Young Which Is On Y Mountain Just Above the Brigham Young University Campus. The 'Y' Is Lite Up During Athletic Events At BYU, Football Games, etc. The 'Y' Is It is made of concrete and is 380 feet high and 130 feet wide (116 by 40 m) The Mountain Is Called Y Mountain.