Packages - trivial question

*To*: mathgroup at smc.vnet.net*Subject*: [mg125185] Packages - trivial question*From*: Šerých Jakub <Serych at panska.cz>*Date*: Mon, 27 Feb 2012 06:39:51 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

I'm sorry for such a trivial question, but what does mean the backapostroph behind the package name, when one wants to get package? For example: << PhysicalConstants` I'm trying to find it in the documentation, but I'm not successfull. Is it the same symbol as it is used for NumberMarks i.e. 0.3333333333333333` for example? I think, that in the case of packages it means something like "definition space", because for example: Remove["Global`*"] should remove all the symbol definitions in current session. But I'm still confused of the little but magic ` Thanks in advance for any enlightenment Jakub

**Follow-Ups**:**Re: Packages - trivial question***From:*Murray Eisenberg <murray@math.umass.edu>

**Re: Packages - trivial question***From:*James Stein <mathgroup@stein.org>