Mustard Mouth

In the Fraktur typeface and similar scripts, a long s (ſ) was used except in syllable endings (cf. Greek sigma) and sometimes it was historically used in antiqua fonts as well; but it went out of general use in the early 1940s along with the Fraktur typeface. An example where this convention would avoid ambiguity is Wachstube, which was written either Wachſtube = Wach-Stube (military guard-house) or Wachstube = Wachs-Tube (tube of wax).