From The General Armory of England,
Scotland, Ireland and Wales by Sir Richard Burke; 1967
An ancient arms given for the spelling of the name Lang are as follows:
Sable on a fesse between two cinquefoils in chief argent and on a mount
in base three oak sprigs vert, acorned or, the text letters A, B, C, D,
E, F, of the field. Crest: Three oak sprigs acorned.