hook 'em horns

The Person Who Created The Famous Longhorn Sign Has Passed Away
Anyone know where that Hook 'em Horns sign came from?
A University of Texas cheerleader first flashed that famous Hook 'em Horns sign at a pep rally in 1955 before Texas played TCU, and it didn't take long before it became associated with UT at spots around the world.  It's gone hand-in-hand with Lon…