Information about a column and the data it holds? I'm working with a table that has 3 different dates associated with each item in the table. I don't understand what each time is so I want to know if there's a standard place that the person who made the table may have documented what they mean. 

RecoveryDate              |UpdateDateTime           |InitialCheckIn
2015-04-06 11:00:00.000   |2015-05-22 08:52:35.373  |2015-04-06 11:04:35.837
2015-04-02 11:07:00.000   |2015-05-06 12:52:48.923  |2015-05-01 13:03:44.977
2015-05-07 09:50:00.853   |2015-07-01 11:09:53.337  |2015-05-26 10:03:46.760
2015-05-22 09:25:00.000   |2015-06-05 08:27:43.917  |2015-05-26 09:24:47.100
2015-05-26 09:39:00.000   |2015-06-30 12:48:20.960  |2015-05-26 10:03:46.620
2015-05-29 09:57:00.000   |2015-07-02 13:53:29.277  |2015-06-03 10:21:59.687
2015-06-01 12:05:00.000   |2015-06-02 14:25:01.197  |2015-06-01 12:07:33.827
The logical built in place to put this kind of metadata about columns might be in the description box when the column is selected in the table designer.



Behind the scenes this gets saved as an extended property with MS_Description as the property name.

It would be extremely pushing it to claim that this is "standard" or common practice though.