Tape measure markings

I know that the red numbers found every 16" on a tape measure are for laying out studs in a wall. But what is the little diamond shape at 193⁄16 "?

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SINGER 00218 Tape Measure, 60-Inch

Tape Measure Markings Diamond Shapes On Measuring Tape

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My tape measure has markings that are half the actual distance

Diamond Truss Marks on Tape Measures

Short Tape Steel BT

All about reading the tape measure - SewGuide

Dritz 120inch Quilters Tape Measure is extra wide at 3/4in and has large clear markings. The tape measure features metric on one side and inches on

Tape Measure with INCH and CM markings (120 and 1.90m)

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