olemus
füüsiline või virtuaalne kihtkogum

Wiktionary:
1.1. a large pile of hay, grain, straw, or the like, larger at the bottom than the top, sometimes covered with thatch
1.2. a pile of similar objects, each directly on top of the last
1.5 an extensive collection
3.3 an implementation of a protocol suite (set of protocols forming a layered architecture)
Synonym: protocol stack
3.4 a combination of interdependent, yet individually replaceable, software components or technologies used together on a system
Synonym: technology stack

näiteid
- protokollivirn
- tehnoloogiavirn