What is Postage stamp block?

In two-dimensional conformal field theory, Virasoro conformal blocks are special functions that serve as building blocks of correlation functions. On a given punctured Riemann surface, Virasoro conformal blocks form a...

DC blocks are coaxial components that prevent the flow of audio and direct current frequencies while offering minimum interference to RF signals. There are three basic forms of DC blocks....

In graph theory, a branch of combinatorial mathematics, a block graph or clique tree is a type of undirected graph in which every biconnected component is a clique. Block...

In linear algebra, a Block LU decomposition is a matrix decomposition of a block matrix into a lower block triangular matrix L and an upper block triangular matrix U. This...

A Media Block or Integrated Media Block is a component in a digital cinema projection system. Its purpose is to convert the Digital Cinema Package content into data that ultimately...

A postal tax stamp refers to a stamp which raises revenue for charity or war related projects. Postal tax stamps are similar to semi-postals, except their use is mandatory instead...

Stamp collection is a common practice among retail outlets in Hong Kong. The concept is to allow customers to redeem free gifts or shopping discounts after purchase. The general mechanism...

In philately, a mint stamp is one which is in its original state of issue, is unused, has never been mounted and has full gum, if issued with gum. The...

A butter stamp, is a device for stamping a design onto a block of warm butter. They were sometimes commercial but usually purely decorative and applied in homes. The stamps...