We have used this code many times in our site on setting up Google analytic's.  What this Code mean where does it signifies?

Can any one of you tel me what is the meaning of UA in Google analytics?

UA = user agent

See:
http://www.microsystools.com/products/http-user-agent/

HI.
In Google analytics UA stands for user agent.

User Agent is the mean, which user agent have to track in the number mean )

I have working in SEO field from last 2 years but i have never noticed this thing. Great thanks to all members of this forum. 

Full form of UA is User Agent in Google analytics.