(medicine) A QRS complex.

plural of qr

plural of QR

(marketing, retail, logistics, manufacturing) Initialism of quick response. / Ellipsis of QR code. / (medicine) Initialism of quiet room. / (pressure cooking): Initialism of Quick Release.

Abbreviation of quarter (of the year).

(medicine) A series of graphical deflections on a typical electrocardiogram that represents the electrical changes generated by the depolarization of the heart ventricles.

plural of QRS complex

A two-dimensional barcode, typically used to link to a website.

plural of QR code

(linear algebra) A decomposition of a matrix into a product of a unitary matrix (orthogonal matrix) and an upper-triangular matrix.