Funny | Random | Wordplay | Pet Peeves

Does It Annoy You When People Expand One of the Letters in an Acronym?

There’s a name for it: RAS syndrome

Alan AJ
2 min readNov 28, 2023

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An AI-generated ATM with a sign above that says “ATM Machine”. On the screen, it says “LCD DISPLAY”.
Two examples of RAS syndrome. Image created by the author using Image Creator from Microsoft Bing. The text was modified slightly using Affinity Photo

When I worked for an electronics company, it annoyed me when colleagues said things like ‘LCD display’ or ‘ISBN number’.

When expanded, all these terms repeat themselves:

  • LCD display — Liquid Crystal Display display
  • PCB board — Printed Circuit Board board
  • ISBN number — International Standard Book Number number
  • UPC code — Universal Product Code code
  • USB bus — Universal Serial Bus bus

Someone came up with a name for this

  • RAS syndrome — Redundant Acronym Syndrome syndrome

According to Wikipedia, the term RAS syndrome was coined in 2001 in a light-hearted column in New Scientist.

More examples

It’s surprisingly common! And in some cases (e.g. ETA), it’s not the last letter that gets repeated.

  • ATM machine — Automated Teller Machine machine
  • CMS system — Content Management System system

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Alan AJ

One day I'll think of something good to put here. For now, just know I'm 50-something years old and I keep writing about life.