The rank insignia in the British Army and Royal Marines, as well as many Commonwealth countries, is a crown above a 4 pointed "Bath" star, also colloquially referred to as a "pip". The crown has varied in the past with different monarchs; the current one being the Crown of St Edward. Most other Commonwealth countries use the same insignia, or with the state emblem replacing the crown.
In modern British forces, a Lieutenant Colonel usually commands a regiment (in the artillery and armoured regiments) or a battalion in the Infantry.
From 1 April 1918 to 31 July 1919, the Royal Air Force maintained the rank of lieutenant colonel. It was superseded by the rank of wing commander on the following day.