Veltuhlið

Veltuhlið is an Icelandic term that translates to "turnstile" or "revolving door" in English. It refers to a type of gate that allows only one person to pass at a time, typically by rotating in a circular motion. These devices are commonly found in public places such as entrances to subway stations, sports stadiums, and other venues where crowd control and security are important.

The primary function of a veltuhlið is to regulate the flow of people, preventing multiple individuals from entering or exiting simultaneously and ensuring that each person is accounted for. This can be crucial for ticketing purposes or to maintain order in busy areas. Some veltuhlið are designed with electronic sensors to detect movement, while others are manually operated.

In a broader, metaphorical sense, "veltuhlið" can also be used to describe a situation where individuals or entities repeatedly enter and leave a particular system or organization, often in rapid succession. This usage highlights a sense of constant change or a lack of stability within that system. The term encapsulates the physical mechanism of controlled passage and its abstract application to dynamic situations.