3 ms·

Interesting. Where are you from? I've never seen that syntax for centuries before.

• dcminter 6y ago
  FWIW I'm from the UK and was taught this notation in high school history classes (though the C encircled the 19 when hand-written). That said I had trouble parsing the "C19" too so I don't think I've seen it used in print much. I tried to read it as a UK postcode zone first :) (I used to live in SW19)
• OJFord 6y ago
  UK. Wikipedia doesn't have an explicit explanation/history of it that I can find, but it does feature on disambiguation pages, e.g. https://en.wikipedia.org/wiki/C17 https://en.wikipedia.org/wiki/C17
• mrkwse 6y ago
  I'm familiar with it and from UK but think it's mostly commonly used in academia and don't know where else it might be commonly seen.
• stordoff 6y ago
  I've seen it used somewhat often in the UK (almost entirely in academia as far as I can recall), at least frequently enough that I've used it in my own writings despite not studying history. At a quick search, I can find a couple of sources that suggest it for notetaking at least: * University of Portsmouth (listed under "Common general abbreviations") https://www.port.ac.uk/student-life/help-and-advice/study-skills/research-reading-referencing-and-citation/helpful-abbreviations-for-speedy-note-taking https://www.port.ac.uk/student-life/help-and-advice/study-sk... * University of South Australia (under "Common symbols and abbreviations") https://lo.unisa.edu.au/pluginfile.php/1687781/mod_resource/content/0/Abbreviations%20for%20note%20taking_Sept_2017.pdf https://lo.unisa.edu.au/pluginfile.php/1687781/mod_resource/...