What is LUD ???

[nayaseed]

I have been seeing this LUD in all the posts what does that stand for? And where and from whom can i get that information from?
Thanks in Advance :
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My case:

EB3/140/485 Concurrent 01/24/2004
140 Approved 2/28/2005
485 Waiting.

 

[sertra2002]

LUD - Last Updated (on Date.)

If you register at the USCIS website https://egov.immigration.gov/cris/jsps/selectusertype.jsp;jsessionid=bNonmAzs7Jv_ you can 'track' your case and every time they touch your case, you should see change in the column Last Updated .