apertures

n.

a device that controls amount of light admitted

a natural opening in something

an man-made opening; usually small

Visual Guidance of Walking Through Apertures
Visual guidance of walking through apertures: Body-scaled information for affordances.
Nanolithography using high transmission nanoscale bowtie apertures.
Wire routing by optimizing channel assignment within large apertures
Transmission through a Conducting Screen Perforated Periodically with Apertures
Analytical formulation for the shielding effectiveness of enclosures with apertures
Redistribution Mechanism of Chloromethylsilanes Catalyzed by HZSM-5 with Big and Small Apertures
A finite-element-boundary integral formulation for scattering by three-dimensional cavity-backed apertures
Dressings comprising adhesive coated thin films and backing layers on facings having apertures; distribution of fluids on injuries; ...
Load-bearing component`s deformation monitoring device for e.g. bridge, has evaluator to trigger warning signal when apertures inter...