I was looking for the past usage of some of the inverted signs in books.

I found out that all of them suddenly surged after 2004-2005.

Google Ngram Viewer 1, Google Ngram Viewer 2, Google Ngram Viewer 3, Google Ngram Viewer 4

What is the reason for the surge in using these signs after 2004-2005?

  • 2
    I suspect that since they all increase at the same time and with a similar profile that this is a change in the algorithm being used.
    – mdewey
    Commented Mar 25, 2022 at 15:22

1 Answer 1


I think it's related with the growing use of spanish in Internet.

These symbols are used in spanish language, which today is the 3° idiom in Internet. So, his presence is more and more visible.

  • I think the NGrams are for books so your explanation seems rather far from the mark. Can you edit it to explain the link between the internet and books?
    – mdewey
    Commented Mar 28, 2022 at 12:26

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