nopaque/app/static/sass/abstracts/_service-icon-variables.scss

$service-icon-letters: (
  "file-setup-pipeline":       "E",
  "tesseract-ocr-pipeline":    "F",
  "transkribus-htr-pipeline":  "F",
  "spacy-nlp-pipeline":        "G",
  "corpus-analysis":           "H"
);