میروم, Not میروم: Why the ZWNJ Key Matters Here
Take the word میروم ("I go") — it's the prefix می plus the verb stem روم, and correct Persian requires a narrow visual break between them without an actual word space. That break is the ZWNJ key, sitting second-to-last in the 5th row, right before Space.
Skip it and the two parts fuse into one connected shape that looks wrong to any Persian reader. Use a full space instead and you've technically created two separate words, which throws off word counts and can confuse spell-checkers. ZWNJ is the only one of the three options that's actually correct — it's worth reaching for any time you're typing a prefix-plus-stem construction like this one.
The Hamza Cluster in the Last Row: أ إ ء ئ ؤ ة
The first six keys of the 5th row are a set of hamza-carrying letters and teh marbuta, mostly there for spelling Arabic-origin words the way they're conventionally written in formal or literary Persian — religious terminology, certain loanwords, and academic text. Everyday casual writing rarely needs most of them; plain ا and ی (both elsewhere on the keyboard) cover the vast majority of ordinary Persian. Reach for this cluster specifically when you're transcribing a term that has a fixed, borrowed Arabic spelling.
Persian's Own Quotation Marks: « »
Persian convention uses guillemets — « and » — for quotations rather than English-style double quotes. Both are in the 5th row, right next to each other, just before the hamza cluster. If you're pasting Persian text into a document and the quotation marks look unfamiliar, this is why — it's the typographically correct form for the language, not a mistake.
Persian ک Isn't the Same as Arabic ك
If you've ever copied text between a Persian source and an Arabic one, you may have ended up with the wrong Kaf without noticing. Persian ک and Arabic ك are separate Unicode characters — the top stroke is drawn slightly differently — but at normal reading size the difference barely registers. This keyboard's 3rd row always inserts the Persian-correct ک, so text typed here will match Persian fonts and won't silently pick up the Arabic form.