Sefer HaTerumah, Simanim
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הכותב צריך ליזהר לזיין ולעשות תגין בראשי אותיות שעטנ"ז ג"ץ וטוב למנוע פן יקלקל האותיות.
Sefaria Community Translation
The one who writes needs to be careful to craft and make the crowns on top of the letters, shin, ayin, tet, nun, zayin. But it is better to refrain [from making crowns], lest he ruin the letters.