On it's own it is is a standard unit of measurement, but as a suffix is considered standard in English since time immemorial to reflect anything "written or drawn", it features in the word "telegram", and can be traced as a suffix back to ancient Greece.
Instagram Cracks Down On Connected Apps Using “Insta” And “Gram” [http://techcrunch.com/2013/08/19/instagram-cracks-down-on-co...]