Pleat fold symbol

Paired mountain and valley arrows in alternation.

Also known as: Pleat arrows origami, Concertina fold symbol

CulturalEveryday & digitalQuiet profile

Meanings

In the Yoshizawa-Randlett notation a pleat is shown as alternating mountain and valley creases folded together, gathering the paper in a concertina.

Culturally establishedVerified fact
Instructs that alternating mountain and valley creases be folded together into a pleat.
Contexts: History
Culturally establishedVerified fact
Depends on the mountain and valley line styles the catalogue already holds, since the pleat is those two creases in alternation rather than a new kind of fold.
Contexts: History

Visual description

Alternating dashed and dash-dot crease lines with arrows showing them folded together in one motion.

A fuller structured visual breakdown is not yet documented for this symbol.

Confidence

IdentityModerate confidence: Moderate confidence because the identity is documented in encyclopedic references, but only a single source has been found so far.
Historical originLow confidence: Low confidence because the historical origin is documented in encyclopedic references, but only a single source has been found so far, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useModerate confidence: Moderate confidence because the current use is documented in encyclopedic references, but only a single source has been found so far.
Visual matchModerate confidence: Moderate confidence because the visual match is documented in encyclopedic references, but only a single source has been found so far.

Sources

Yoshizawa–Randlett system
Wikipedia · retrieved 2026-08-23
Tertiary reference, cited for the conventional form of a notation and the tradition that uses it. Where a body maintains the notation, that body is cited alongside and governs.

Last reviewed 2026-08-24

Help improve this page

Meanings

In the Yoshizawa-Randlett notation a pleat is shown as alternating mountain and valley creases folded together, gathering the paper in a concertina.

Culturally establishedVerified fact

Instructs that alternating mountain and valley creases be folded together into a pleat.

Contexts: History

Culturally establishedVerified fact

Depends on the mountain and valley line styles the catalogue already holds, since the pleat is those two creases in alternation rather than a new kind of fold.

Contexts: History

Confidence

IdentityModerate confidence: Moderate confidence because the identity is documented in encyclopedic references, but only a single source has been found so far.
Historical originLow confidence: Low confidence because the historical origin is documented in encyclopedic references, but only a single source has been found so far, but early or supporting evidence is limited, but the regional or cultural match to this specific claim is not precise.
Current useModerate confidence: Moderate confidence because the current use is documented in encyclopedic references, but only a single source has been found so far.
Visual matchModerate confidence: Moderate confidence because the visual match is documented in encyclopedic references, but only a single source has been found so far.