Polish orthography is the system of writing the Polish language. The language is written using the Polish alphabet, which derives from the Latin alphabet, but includes some additional letters with diacritics. The orthography is mostly phonetic, or rather phonemic – the written letters (or combinations of them) correspond in a consistent manner to the sounds, or rather the phonemes, of spoken Polish. For detailed information about the system of phonemes, see Polish phonology.
The diacritics used in the Polish alphabet are the kreska (graphically similar to the acute accent) in the letters ć, ń, ó, ś, ź; the kreska ukośna (stroke) in the letter ł; the kropka (overdot) in the letter ż; and the ogonek ("little tail") in the letters ą, ę. There are 32 letters in the Polish alphabet: 9 vowels and 23 consonants.
The letters q (named ku), v (named fau), and x (named iks) do not belong to the Polish alphabet, but are used in some foreign words and commercial names. In loanwords they are often replaced by kw, w, and (ks or gz), respectively (as in kwarc "quartz", weranda "veranda", ekstra "extra", egzosfera, "exosphere").
When giving the spelling of words, certain letters may be said in more emphatic ways to distinguish them from other identically pronounced characters. For example, H may be referred to as samo h ("h alone") to distinguish it from CH (ce ha). The letter Ż may be called "żet (or zet) z kropką" ("Ż with a dot") to distinguish it from RZ (er zet). The letter U may be called u otwarte ("open u", a reference to its graphical form), to distinguish it from Ó, which is sometimes called u zamknięte ("closed u"), u kreskowane ("accented u") or u z kreską ("u with a stroke accent"), alternatively o kreskowane ("accented o") or u z kreską ("o with a stroke accent").
Note that (unlike in languages such as French) Polish letters with diacritics are treated as fully independent letters in alphabetical ordering. For example, być comes after bycie. The diacritic letters also have their own sections in dictionaries (words beginning with ć are not usually listed under c).