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A triangle or slit showing where two pieces must align.
Also known as: Balance mark, Pattern notch
Notches are triangles at a pattern's edge that must be matched when two pieces are joined. Single, double and triple notches distinguish front from back, which is what stops a sleeve being sewn in the wrong way round.
Marks a point on a seam that must be matched to the corresponding point on the joining piece.
Contexts: Laundry
Uses single, double and triple notches to distinguish which edge is which, conventionally single towards the front and double towards the back.
Contexts: Laundry
A small triangle projecting outwards from the cutting line of a pattern piece, singly or in groups.