This nymph designed by Andre Puyans, the AP either stands for the designer name or more likely all-purpose.It just looks like many things that trout
AP Nymph
Don't be fooled by the simplicity of the Biot Nymph
Fly Tying the Flameback Nymph (from Craft Store Materials)
Fly Tying the AP Black Beaver (Andy Puyan Nymph Pattern)
Nymphs Tactical, New 2024 Collection
Fly Tying for Beginners - The Sparkle Dun Dry Fly
Fly Tying the Allegany All Purpose (AP) Nymph Fly Pattern
Oliver Burch's Trout and Grayling Monthly Report - June 2020
The Green Peter - definitely not a boring wet fly pattern!