what means the build number at the bottom of account page?

At the bottom of page, behind the "Terms of Use" I see the "Build #159"

What this build number means?

(there are no tooltip around, so, I just wondering - if it is a PS build number then why I've got only #145 (I purchased fb.lic.today) and how I can obtain a #159 ?) 

ref:

https://account.jetbrains.com/

1 comment
Official comment

Hello,

This number is not related to any IDEs and is just a build number of the account web site. You can safely ignore this.

The latest officially released build number can always be seen in <https://www.jetbrains.com/phpstorm/download/>.

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