Considered a cardinal sin for many born and bred Edinburghers, dare to add an extra S to Princes Street, or an R to Calton Hill, and prepare for a thorough dressing down.
From Western Approach Road to St Andrew’s Square, we take a look at ten places around Edinburgh that people keep getting wrong.
5. St Andrew Square
St Andrew Square, named in the 18th century after the patron saint of Scotland, continues to have its apostrophe re-attached by tourists and an unhealthy number of locals, despite losing it long ago. Photo: Greg Macvean
6. Scott Monument
The Scott Monument, built in tribute to the writer Sir Walter Scott, has been called everything from the "Scotch" Monument, to the "Scots Monument" and even the "Scottish Monument". We can see why tourists might get it wrong, but there is absolutely no excuse for locals - you know who you are! Photo: Neil Hanna
7. Cockburn Street
It's pronounced "Co-burn", okay? Just don't get it wrong. We won't go into the reasons why. It's just awkward. Photo: GARETH EASTON
8. Craigmillar
The history of Craigmillar and its castle goes back centuries, and while early spellings, such as Cragmilor and Craigmelor, suggest that, at one time, nobody really knew how it should be spelled, the agreed modern spelling is Craigmillar, and definitely, never Craigmiller. Photo: Photographer: Scott Louden