Mussels or Muscles?!

The other day I got a pleading-for-help message on Etsy -- a crocheter was so excited about making this beautiful vest, but was having problems understanding some of the instructions.  She asked if I could help her figure out the next steps in the project.  So, I went to investigate and discovered that the pattern designer/writer is Danish.  I think she might have used a Google program or something to translate the pattern, and interesting things happened as a result!  The instructions kept referring to making stitches "in the next mussel".  After looking at the original Danish pattern and looking up the original word, I discovered that another meaning of the word "musling" is ....   SHELL!  So, she was trying to describe our shell stitch :-)  Mystery solved!