Ask type designers which single letter gives them the most trouble, and “s” comes up constantly. It has no straight strokes to lean on, no symmetry to exploit, and a shape so specific that even a tiny shift in curve tension can make it look lopsided, wrong, or completely unrelated to the rest of the typeface.

A Short History of “s”

“s” traces back to the Phoenician letter shin, believed to represent teeth, and the earliest pictographic forms show a zigzag or serrated shape, evoking a row of pointed teeth. That angular, zigzagging origin is a genuinely interesting contrast to the smooth, flowing curve “s” has today, and it’s a reminder that the letter’s modern roundness developed gradually rather than being present from the start.

The Greeks adopted a version of the letter as sigma, and Greek sigma kept a more angular character for a long time, especially in its capital form, which still shows a zigzag structure in some traditional renderings. The Etruscans and Romans carried the letter into Latin, and it was really during the Roman period and the centuries that followed that “S” gradually rounded out into the smooth double-curve shape recognizable today.

Lowercase “s” developed the way most lowercase letters did, through medieval scribes simplifying the capital for faster handwriting, but because the capital “S” was already fairly compact and curved by that point, the lowercase version required comparatively little structural change beyond scaling and minor proportion adjustments. This is part of why lowercase and capital “s” remain closely related in shape today, unlike letter pairs such as “r” or “g,” which diverged much more dramatically between their capital and lowercase forms.

Anatomy of a Lowercase “s”

Lowercase “s” is built from a single continuous stroke that curves in two opposite directions, forming what’s sometimes described as two stacked, oppositely-curved arcs joined at a central point. Unlike almost every other lowercase letter, “s” has no straight stems, no flat baselines to rely on, and no symmetry to mirror or reuse — every part of its curve has to be individually resolved.

The upper curve, the lower curve, and the transition point where they meet in the middle are the three zones type designers obsess over most. The upper and lower curves aren’t identical; they’re usually different in size and weight, with the letter typically appearing slightly top-heavy or bottom-heavy depending on the specific typeface’s proportions, an intentional asymmetry that keeps the letter from looking mechanically stiff. The transition point in the middle, sometimes called the spine, needs just the right amount of curvature and thickness — too thin, and the letter can look like it’s about to snap in the middle; too thick, and it becomes visually heavy and clogs at small sizes.

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Because “s” has no straight elements at all, it also needs careful overshoot treatment at both the top and bottom, following the same principle used for “o,” “c,” and “e” — rounded shapes need to extend slightly past the baseline and x-height to avoid looking optically smaller than flat-sided neighbors.

Designing the Letter From Scratch

Many type designers consider “s” one of the last letters to fully finalize, precisely because it’s so resistant to being built from reused parts the way “h,” “m,” or “d” can be. Unlike those letters, “s” can’t really borrow its shape from anywhere else in the alphabet — it has to be drawn essentially from scratch, informed by, but not directly copied from, the curve tension already established in “o” and “c.”

The process typically starts with rough sketches testing different balances between the upper and lower curves, since getting this ratio wrong is one of the fastest ways to make “s” look unstable or off-kilter. Designers then spend significant time on the spine, adjusting its thickness and curvature until the letter feels like a single continuous, confident stroke rather than two separate curves awkwardly stitched together.

Because “s” is used so frequently in English — it’s one of the most common letters overall, and by far the most common letter used to form plurals — designers test it extensively in real words at multiple sizes, checking specifically for any wobble or asymmetry that becomes distracting once the letter repeats often across a paragraph. Many designers report redrawing “s” more times than almost any other lowercase letter before landing on a version that feels right.

Unique Facts About “s”

“s” is widely regarded within type design circles as one of the most difficult letters to draw well, precisely because it has no straight strokes, no symmetry, and no borrowed structure from any other letter to lean on — every curve has to be resolved entirely on its own terms.

Because “s” is the primary letter used to form plurals and possessives in English, it appears constantly throughout ordinary text, which means any flaw in its design becomes far more noticeable, far more quickly, than a similar flaw in a rarer letter like “q” or “z.”

The letter’s zigzag, tooth-shaped Phoenician origin is a genuinely unusual contrast to its final smooth form, and type historians sometimes point to “s” as one of the clearest examples in the entire alphabet of a letter transforming from an angular pictogram into a purely calligraphic, flowing shape over the course of its written history.

“s” in Popular Fonts

In Garamond and other old-style serifs, “s” carries visible calligraphic stress, with the curve thickening and thinning the way a broad-nib pen naturally produces, and a spine that flows with a soft, diagonal rhythm. Helvetica keeps the curves tighter and the spine more vertical and mechanically even, contributing to its clean, neutral character. Futura pushes the upper and lower curves closer to true geometric arcs, though even here, subtle asymmetries remain necessary to keep the letter from looking mechanically stiff or unbalanced.

In script and handwriting fonts, “s” often gets an exaggerated curve or an extended entry and exit stroke, since its naturally flowing shape lends itself well to connecting smoothly with neighboring letters in a cursive baseline.

Summary

Lowercase “s” is the letter that resists shortcuts — no straight strokes, no symmetry, no reusable structure borrowed from elsewhere in the alphabet, just a single continuous curve that has to be resolved entirely on its own terms. From a jagged, tooth-shaped Phoenician pictogram to the smooth double-curve used in every typeface today, “s” has earned its reputation as one of the hardest letters in the entire Latin alphabet to draw well.

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