The long s, ⟨ſ⟩, also known as the medial s or initial s, is an archaic form of the lowercase letter ⟨s⟩, found mostly in works from the late 8th to early 19th centuries. It replaced one or both of the letter s in a double-s sequence (e.g., "ſinfulneſs" for "sinfulness" and "poſſeſs" or "poſseſs" for "possess", but never "poſſeſſ"). The modern ⟨s⟩ letterform is known as the "short", "terminal", or "round" s. In typography, the long s is known as a type of swash letter, commonly referred to as a "swash s". As with other letters, the long s may have a variant appearance depending on typeface: ſ, ſ, ſ, ſ. In some typefaces, this letter has a very similar appearance to the letter ⟨f⟩ (lowercase F), distinguished only by the width of the crossbar. The long s is the basis of the first half of the German ligature ⟨ß⟩ (Eszett or scharfes s, 'sharp s') and of the Middle Scots ⟨Ꟗ ꟗ⟩.
Rules
English This list of rules for the long s is not exhaustive, and it applies only to books printed during the 17th to early 19th centuries in English-speaking countries. Similar rules exist for other European languages. Long s was always used (ſong, ſubſtitute), except:
Upper-case letters are always the round S; there is no upper-case long s. A round s was always used at the end of a word ending with ⟨s⟩: his, complains, ſucceſs However, long s was maintained in abbreviations such as ſ. for ſubſtantive (substantive), and Geneſ. for Geneſis. Before an apostrophe (indicating an omitted letter), a round s was used: us'd and clos'd. Before or after an f, a round s was used: offset, ſatisfaction. In the 17th and early 18th centuries, the round s was used before k and b: ask, husband, Ailesbury, Salisbury, Shaftsbury; in the late 18th century, the long s was used instead: aſk, huſband, Aileſbury, Saliſbury, Shaftſbury. These two exceptions applied only if the letters were physically adjacent on the page, and long s was used if the two were separated by a hyphen and line break, e.g., off-ſet, Saliſ-bury. There were no special exceptions for a double s. The first s was always long, while the second was long in mid-word (e.g., poſſeſſion), or short when at the end of a word (e.g., poſſeſs). See, for example, the word Bleſſings in the Preamble to the United States Constitution. This usage was not universal, and a long followed by a short s is sometimes seen even mid-word (e.g., Miſsiſsippi). Round s was used at the end of each word in a hyphenated compound word: croſs-piece. In the case of a triple s, such words were normally hyphenated with a round s, e.g., croſs-ſtitch, but a round s was used even if the hyphen was omitted: croſsſtitch. In handwriting, these rules did not apply—the long s was usually confined to preceding a round s, either in the middle or at the end of a word—for example, aſsure, bleſsings.
German
The general idea is that round s indicates the end of a semantic part. Thus, long ſ is used everywhere except at the end of a syllable, where further conditions need to be true. The following rules were laid down at the German Orthographic Conference of 1901. The round s is used:
at the end of (non-abbreviated) words:e.g., das Haus, der Kosmos, des Bundes, Pils(however: im Hauſe, die Häuſer, Pilſener) at the end of prefixes, as a connecting s and in compounds at the end of the first part-word, even if the following part-word begins with a long ſ:e.g., Liebesbrief, Arbeitsamt, Donnerstag, Unterſuchungsergebnis, Haustür, Dispoſition, disharmoniſch, dasſelbe, Wirtsſtube, Ausſicht in derivations with word formation suffixes that begin with a consonant, such as -tum, -heit, -keit, -lein, -chen, -bar, -lich, -haft, etc. (not before inflectional endings with t and possibly schwa [ə]):e.g., Wachstum, Weisheit, Häuslein, Mäuschen, Bistum, nachweisbar, wohlweislich, boshaft(however: er reiſte, das ſechſte, cf. below ſt) at the end of a syllable, even if the syllable is not the end of a (part-)word, common in names and proper nouns:e.g., kosmiſch, brüskieren, Realismus, lesbiſch, Mesner; Oswald, Dresden, Schleswig, OsnabrückMany exceptions apply. Long ſ is used whenever round s is not used (for s):
at the beginning of a syllable, i.e. anywhere before the vowel in the center of a syllable:e.g., ſauſen, einſpielen, ausſpielen, erſtaunen, ſkandalös, Pſyche, Miſanthrop (for syllables: Mi⋅ſan⋅throp; alternative variant: Mis⋅an⋅throp)The same applies for the beginning of a syllable of a suffix like -ſel, -ſal, -ſam, etc.: e.g., Rätſel, Labſal, ſeltſam in ſp and ſt (since 1901 also ſz), unless they arise by happenstance (via a connecting s or composition); that includes flexion suffixes starting with t:e.g., Weſpe, Knoſpe, faſten, faſzinierend, Oſzillograph, Aſt, Haſt, Luſt, einſt, du ſtehſt, meiſtens, beſte, knuſpern; er reiſt, du lieſt, es paſſte (modern orthography; traditionally: paßte), ſechſte, Gſtaad in multigraphs that represent a single sound such as ſch (to represent , but not ) and English ſh and doubled consonants ſſ and ſs:e.g., Buſch, Eſche, Wunſch, wünſchen, Flaſh, Waſſer, Biſſen, Zeugniſſe, Faſs (modern orthography; traditionally: Faß), however: EschatologieAlso applies to double s through assimilation:e.g., aſſimiliert, Aſſonanz before l, n, and r if an e is omitted:e.g., unſre, Pilſner, Wechſlerhowever: Zuchthäusler, Oslo, Osnabrück before an apostrophe and other forms of abbreviation:e.g., ich laſſ’ es (casual for ich laſſe es), ſ. (common abbreviation for ſiehe) when the initial ſ of a word is merged with and has priority over the terminal s of a prefix:e.g., in tranſzendent, tranſzendieren, etc.; in this case, the initial ſ of ſzend (from Latin ſcando) is merged with the terminal s of the trans- prefix due to z following the ſ. These rules do not cover all cases and in some corner cases, multiple variants can be found. One such case is whether to apply original semantics (that are largely unknown) or follow spoken syllables; e.g., in Asbest vs. Aſbest as it is spoken As⋅best, but comes from Ancient Greek ἄσβεστος composed of ᾰ̓- plus σβέννῡμῐ, meaning a is a prefix, and thus, a long ſ follows. In Fraktur, the ligature ſt (Unicode: U+FB05 ſt LATIN SMALL LIGATURE LONG S T) is not spaced in spaced setting, as with other ligatures.
History
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![Long s: The ligature ⟨ſt⟩, like ⟨ch, ck, ꜩ⟩, is immune to spaced typesetting. However, it is usually uncoupled as a ligature,[citation needed] unlike the others. A different case is eszett (⟨ß⟩, originally ⟨ſʒ⟩) as it is usually considered a single letter nowadays.](https://upload.wikimedia.org/wikipedia/commons/thumb/0/09/Fraktur-Zwangsligaturen.svg/500px-Fraktur-Zwangsligaturen.svg.png?utm_source=en.wikipedia.org&utm_campaign=parser&utm_content=thumbnail)


