"HOT-COLD GAP" meaning?

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Hi, what does HOT-COLD Gap means in PCB making terms. Is it the pattern-pattern gap at certain schematic portion?
 

I am not familiar with the term but I would think that it is the gap between high and low voltage circuitry.
High voltage being hot, low voltage being cold.

Unless it is something to do with the manufacturing process itself.

Either way - it must be a really old term.
 

Interesting one. I googled for this and found this article to be most useful to answer your question : http://matse1.matse.illinois.edu/sc/b.html

Hot-Cold gap is the difference in conductivity of a conductor when stressed in various differnt temperatures.

Your views please
 

I would go with voltages and protection, SELV, IMO it is a reference to creepage and clearance distances. For 99.99% of PCBs the temp range they work at will not affect conductivity that much that it becomes a concern.
 

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