Iceberg, as with many of my stitch patterns, starts by turning the letters of a word into numbers, charting the numbers, and then turning the chart into a knitting pattern. Here is my blog post about it.
Edited 20 September 2024; the stitch count has changed slightly to add a purl column between each repeat.
This is one of many patterns funded by my backers on Patreon.
Shown with a cast-on count of 59 stitches.