-- Edited by Fried Rice on Friday 4th of September 2015 08:20:06 AM
The 369 is a tag that the original poster added when they opened the thread. If you start a new thread there is a box at the bottom where you can add Tags to make the thread easier to find when doing a search. If you look at the bottom of the thread page you will see the Tag visible there. If you click on the Tag, you will get a list of all the threads that have the same tag.
If everyone who opened a thread used tags, it would make it so much easier to find similar topics. For example placing the tag "solar", when you start a thread about solar equipment, would give you a tag at the bottom of the thread page, which, when clicked would give you a list of all the threads with the same tag. Wouldn't that be a good idea
I have no idea why the tag 369 was used for that thread though, you'll have to ask the Original Poster.
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