The Trim Profile Glossary: Ogee, Cove, Bead, Bullnose, Ovolo, and More

A trim profile is the named cross-sectional shape of a molding — the silhouette you would see if you sliced the piece and looked at the cut end. Almost all millwork is built from a small vocabulary of curves (ogee, cove, ovolo, bullnose) and straight elements (fillet, reveal, quirk) combined in different ways. This glossary defines the profiles and elements you will hear designers, carpenters, and catalogs use: what each one looks like, where it shows up, and the feeling it gives a room. Learn this handful of shapes once and you can read almost any molding on sight.

What is a trim profile, exactly?

A profile is the edge geometry of a molding, not the molding itself. The same profile can appear on a baseboard cap, a crown, a casing edge, or a cabinet door, which is why the vocabulary is worth learning once: it travels everywhere. Carpenters talk in profiles because the shape is what your eye reads, not the board it is cut into. A single stock molding is usually a combination of several of the shapes below, stacked into one silhouette.

Two ideas underlie the whole vocabulary. A concave curve scoops inward and reads soft and shadowed. A convex curve bulges outward and catches light. Nearly every profile name below is just a specific arrangement of those two moves, sometimes separated by a flat.

What are the main curved profiles?

The curved profiles are the ones that give a room its character. Here are the ones you will actually encounter, from simplest to most compound.

Cove

A single concave quarter-circle that scoops inward. Cove is quiet, modern, and restrained; it throws a soft shadow and tends to recede rather than announce itself. You will see it as a simple crown, as the transition inside a built-up assembly, or as a subtle detail under a cabinet. It reads clean and unfussy.

Ovolo

A convex quarter-round, the outward-bulging mirror image of the cove. Ovolo feels solid and traditional; because it pushes toward you and catches light along its crown, it reads as a highlight rather than a shadow. It is common on casing edges, chair rails, and the lip of a stool, and it gives an edge a rounded, substantial character.

Cavetto

A concave quarter-round used as a hollow, often at the top of a cornice. Cavetto is closely related to the cove; the term is more common in classical and architectural contexts. Its feel is the same family: recessed, shadow-holding, and calm.

Ogee

An S-curve that combines a concave and a convex arc, so the shape flows from a hollow into a round. The ogee is the workhorse of classical trim — Federal and Colonial homes lean on it heavily — and it feels formal, graceful, and time-tested. A standard ogee runs convex-over-concave; a reverse ogee flips the order for a slightly different play of light. If a room feels traditionally finished, an ogee is usually doing part of the work.

Bead

A small convex half-round, like a raised cord running along the trim. A bead adds a crisp shadow line and a note of refinement; it shows up on beadboard, casing edges, and the transition between elements. When a bead is set into a recess so it reads as a distinct raised detail, that recess is a quirk (below). Beads make trim feel considered and a little dressier.

Bullnose

A fully rounded, semicircular edge with no hard corner. Bullnose feels soft, contemporary, and forgiving; it is common on stair treads, window stools, and drywall corners, and it suits casual, transitional, and modern rooms. Because it has no sharp arris, it also reads as durable and child-friendly.

Scotia and torus

Two classical siblings worth knowing. A scotia is a deep concave curve, deeper than a cove, that holds a strong shadow — you will see it under stair treads and in classical bases. A torus is a large convex half-round, essentially an oversized bead, often forming the bottom bulge of a traditional baseboard or column base. Torus reads heavy and grounded; scotia reads dark and recessive.

What's the difference between an ogee and an ovolo?

An ovolo is a single convex quarter-round, while an ogee is a compound S-curve made of one convex and one concave arc. The ovolo gives you one clean highlight; the ogee gives you a highlight and a shadow in the same profile, which is why the ogee reads as more ornate and formal. If you want a simple rounded edge, that is an ovolo. If you want the flowing, classical S, that is an ogee. Designers often reach for the ovolo where they want quiet weight and the ogee where they want visible tradition.

What do the small elements — fillet, reveal, backband — do?

These elements are rarely the star, but they are what separates crisp millwork from mushy millwork. They are the punctuation of trim.

• Fillet: a small flat band that separates two curves so each keeps its own shadow line. Fillets are the connective tissue of built-up profiles — without them, adjacent curves blur together and the detail goes soft.
• Quirk: a small, sharp recessed groove, usually next to a bead. The quirk is what makes a bead read as a distinct raised element rather than a lump; it cuts a hard, dark line that gives the profile snap.
• Reveal: a deliberate flat setback between two surfaces — most famously the sliver of exposed jamb left when casing is held back from the edge of a door frame. A reveal is a designed shadow gap; consistent reveals are a hallmark of careful work, which is why they come up constantly in interior door casing styles.
• Backband: a small L-shaped molding applied around the outer edge of flat casing to add depth and a stepped shadow. Backband is the easy way to make plain casing look substantial and layered without switching to a wider board.
• Return: not a shape but a move — where a molding wraps back to the wall so it never shows a raw cut end. A missing return is one of the fastest tells of rushed work.
• Arris: the sharp edge where two surfaces meet. It is the opposite intent of a bullnose, and knowing the word helps when a spec calls for it eased or kept crisp.

How do repeating ornaments differ from profiles?

Profiles are continuous shapes that run the length of the molding; ornaments are repeating carved or applied motifs spaced along it. The difference matters because ornaments are read as rhythm and pattern, while profiles are read as edge and shadow. The two most common ornaments in residential trim:

• Dentil: a row of small, evenly spaced rectangular blocks, like a set of teeth, usually tucked under a classical cornice or crown. Dentil molding reads formal and traditional and adds a strong sense of order and rhythm — a signal of Federal, Georgian, and Colonial vocabularies.
• Egg-and-dart: an alternating pattern of oval egg shapes and pointed dart shapes, carved into an ovolo. It is one of the oldest ornaments in Western architecture and reads richly classical; you will find it on formal cornices, mantels, and casing where a room wants unmistakable tradition.

Other repeating motifs you may encounter include the rope (a twisted-cord molding), the rosette (a carved corner block at the top of door casing), and fluting and reeding (parallel concave grooves or convex ridges run vertically on pilasters and casing legs). All of them share the same job: they turn a plain run into a patterned one.

How do I choose a profile for a room?

Match the profile family to the home's architecture and let the ceiling height set the scale. Traditional and historic homes generally want the classical curves — ogee, scotia, torus, often with dentil or egg-and-dart accents — while modern and transitional rooms usually read better with the quieter shapes: cove, bullnose, flat stock with a clean reveal. Concave profiles (cove, cavetto, scotia) hold shadow and recede; convex profiles (ovolo, bead, torus) catch light and advance, so use convex shapes where you want the trim to feel present and concave shapes where you want it to feel calm.

Scale is the other half of the decision. A delicate bead that looks refined on eight-foot walls can vanish in a two-story foyer, and the same proportional logic that governs a baseboard governs a crown — see baseboard heights and proportions and the complete guide to crown molding profiles for how height and profile work together. When you are specifying trim across a whole home, settle on a small, consistent palette of profiles and repeat it — a discipline that matters most for interior designers coordinating trim across many rooms.

The bottom line on trim profiles

Trim is a small vocabulary used in endless combinations. Once you can name the ogee, the cove, the ovolo, and the fillet, you can read almost any molding in the room and specify it with confidence instead of pointing at a catalog picture. The shapes are simple; using them coherently is the craft.

If you are trying to pin down the right profiles for a specific room or a whole-home package, a free Discovery Call is the fastest way to turn this vocabulary into a plan that fits your architecture.