The function naming convention used by Emacs.

[Hongyi Zhao]

As far as function names are concerned, are there some established
conventions used by Emacs? For example, I noticed that there are so
many functions in Emacs named by the suffix `-p', say,
`file-exists-p', `ht-equal-p', and so on. But I still can't figure out
the meaning of this suffix. Any tips will be appreciated.

Best, HZ
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province