NickB Method: Constant Lines Help

On Nick’s website, in the blog section, the first video down there is a video where he takes a short trade at the break of the 135.700 for the GBP/USD. The line isn’t a Support/Resistance Zone or a Scalp Line, but instead a Constant Line. What is a constant line and how are they formed?

Link to Website: Forex Education | Nick’s Forex Blog

It’s the first video down, posted on March 8th, 2010. The Title of the blog article is "GBP/JPY Win 70 Pips (Short @ 135.70)

He explains them in the explanation for his method. They are historical support and resistance lines, meaning they have been support and resistance many times through the years.

I’m reading through the explanation of his method now, thanks for the URL.