The 16-20 knot aka Pitzen knot is a strong and compact knot, one that is ideal for thin tippets.

For more fly fishing knots and rigs, check out the book “Fly Fishing Knots And Rigs: 7” by Andy Steer/Angling Knots: https://www.amazon.co.uk/dp/1704174686/ref=cm_sw_em_r_mt_dp_EZ932FAT2N03QFAGG1R8.

Andy Steer Illustrations
E-mail: andy.steer@iae.nl

Also look at:
https://flyfishing-blog.com/flyfishing-blog.com/2021/02/09/new-fly-fishing-colouring-book-by-andy-steer/
https://flyfishing-blog.com/flyfishing-blog.com/2020/05/05/sea-fish-colouring-book-by-andy-steer/
https://flyfishing-blog.com/flyfishing-blog.com/2017/06/16/new-fly-fishing-knots-waterproof-guides-by-andy-steer/