What does ! mean?

[Arun Chandrasekaran]

On Wednesday, 27 September 2017 at 14:34:06 UTC, Eugene Wissner 
wrote:
> On Wednesday, 27 September 2017 at 14:23:01 UTC, Ky-Anh Huynh 
> wrote:
>>
>
> See also the following chapter in Ali's book:
> http://ddili.org/ders/d.en/templates.html

This chapter is what hooked me with D. Naming that chapter as 
"Templates for Human Beings" won't be an exaggeration.