[not2b]

That's Benjamin Graham. (since there's another reply, the parent article points to the wrong Graham).

[iamaaditya]

Graham's Number, as in 3 ↑↑ 3, is named after Ron Graham.

[1] https://plus.maths.org/content/too-big-write-not-too-big-gra...

[2] https://en.wikipedia.org/wiki/Graham%27s_number?oldformat=tr...

[3] And here is the man himself describing it https://www.youtube.com/watch?v=GuigptwlVHo

[gabrielsroka]

3 ↑↑↑↑ 3 = g1, Graham's Number is g64. See the article for details.

I'd write it out, but this margin is too narrow.

[agumonkey]

I find it stupidly fascinating how notation compressed a quantity so large in so few.