W is for the Wavy Navy
From The Oxford Companion to Ships and the Sea:
a colloquial term in the British Navy to describe officers and ratings of the reserves. The term comes from the wavy stripes of gold braid which used to be worn on their sleeves by reserve officers as indications of rank - but is no longer applicable since, in 1956, the wavy stripes were abolished and reserve officers now wear the same rank insignia on their sleeves as active service officers. (p. 929)
This is my contribution for the Blogging from A to Z challenge. Short and sweet I hope.