Who knows what r refers to in a BSN?

I have read an article recently. segmentfault. coma119004262521577p should indicate that phps should refer to standardr. I have read an article recently.
Http://segmentfault.com/a/1190000002521577

P should refer to php
S should refer to standard
R?

Reply content:

I am reading an article recently
Http://segmentfault.com/a/1190000002521577

P should refer to php
S should refer to standard
R?

R should be Recommendation. The full name of "R" is PHP Standard Recommendation. (LZ positive solution)

To propose a PHP Standard Recommendation (PSR ):
* Fork this repo, create a branch, checkout that branch, add the PSR in proposed/, push the branch to Github, and send a pull request; or,
* Create a ticket to start a discussion on Github; or,
* Start a conversation on the mailing list.

Source: https://github.com/php-fig/fig-standards#proposing-a-standard-recommen...

P.s. PSR-x has been proposed and accepted, so it is not Proposing ....

Proposing a Standards Recommendation

It should be said: PHP's SRS
In this example, the "PSR" is the abbreviation of Proposing a Standards Recommendation (propose standard recommendations ).
P is not PHP