brass ceiling
n.— «Dunwoody’s daughter, Lt. Gen. Ann E. Dunwoody, 55, has just been tapped by President Bush to take over a new Army command as the first female four-star general in the history of the armed services.…Dunwoody was proud to see his daughter burst through “the brass ceiling,” as service personnel refer to it.» —“Dad proud of daughter in line to be 4-star general” in Englewood, Florida ABC News July 15, 2008. (source: Double-Tongued Dictionary)