Elementary: what is the dollar-sign ($) in a column name mean?

I periodically see dollar signs in column names in Oracle tables. For example, when I create a LOB, often times the LOB segment will end in a dollar-sign (or two). Sometimes when one of the developers creates an object, I see some of the field namess have dollar-signs at the end of them.
What does the dollar-sign mean?
What does two dollar-signs mean?
Just curious...they seem to function as normal characters.

They are just normal characters. But Oracle (and other vendors) will frequently use characters like $ that normal developers don't normally use in order to create conventions around table names.
For example, Oracle provides a number of data dictionary tables that use x$, v$, and gv$ as prefixes. There is nothing inherently special about those prefixes. But they convey meaningful information to the users of those systems (x$ views are undocumented views, v$ views provide information about activity on the local instance, gv$ views provide information about activity on all the instances of a RAC cluster). And using those sorts of prefixes prevents confusion between application tables and Oracle tables. Lots of applications, for example, have a SESSION table. Having the V$ prefix for the Oracle-delivered V$SESSION table makes it easy to avoid confusion from having two identically named tables.
Justin

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Elementary: what is the dollar-sign ($) in a column name mean?

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