An eth is a letter that was used in Old and Middle English, and is still used in Icelandic. It usually represents the
th sound. In DP projects, it usually looks like:
The characters for capital and lower case eth, Ð and ð, are available in the Basic Latin character suite, so we can use these symbols directly when proofreading. You can insert them using the ~ picker in the Proofreading Interface toolbox.