Threads may be Stickied by a mod.
When a thread has been stickied it is 'stuck' to the top of the forum.
Stickies stay up, but dissapear after a while if they do not get posted in. For example, selecting show threads from last 2 weeks shows stickies that have been posted in within the last two weeks.
Stickied threads are differentiated by this icon 
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