RAS Syndrome is a term coined by the New Scientist in 2001. It refers to any word where one or more letters from the acronym are used in conjunction with the abbreviated form.
A classic example is “PIN Number”, which in expanded form stands for “Personal Identification Number Number”.
There is a touch of irony though to this syndrome or maybe clever humour on the part of the coiners. RAS actually stands for redundant acronym syndrome, making RAS Syndrome an example of itself.
However, RAS Syndrome has been known by other names that make it even more comical, including PNS Syndrome which becomes; PIN Number Syndrome Syndrome, and ultimately – Personal Identification Number Number Syndrome Syndrome.