I slightly modded the name, it can be found under the search term “Universal Oscillator” : https://www.prorealcode.com/prorealtime-indicators/universal-oscillator-john-ehlers/

It’s a supersmoother (and has a noise filter, that’s the Exp(–1.414 part).

(As an aside, the other oscillator I mentioned I want to test and compare, as it may have less lag, is the Universal Oscillator (supersmoother) with a Roofing Filter known as Ehler’s My Stochastic (it has the added roofing filter part with the Cos(.707) code) : https://www.prorealcode.com/prorealtime-indicators/my-stochastic-oscillator-john-ehlers/)