ST stands for Steno and not for Stub; corresponding discussions can also be found on the Fountainpennetwork forum. For stub nibs no separate abbreviation exists, since stub forms historically corresponded to standard grinding before the rise of the ballpoint made today's usual ball nibs the standard. Steno nibs are not necessarily rare but achieve premiums on coveted models: at Montblanc, for example, a 32 with steno nib can cost around 100 euros instead of 60 euros, a 146 with ball nib rise from 200 to 600 euros; Pelikan prices vary similarly.