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  2. Signaling of the New York City Subway - Wikipedia

    en.wikipedia.org/wiki/Signaling_of_the_New_York...

    A signal in the Flushing–Main Street station. Most trains on the New York City Subway are manually operated. As of 2022, the system currently uses automatic block signaling, with fixed wayside signals and automatic train stops. Many portions of the signaling system were installed between the 1930s and 1960s.

  3. Slack Technologies - Wikipedia

    en.wikipedia.org/wiki/Slack_Technologies

    The name is an acronym for "Searchable Log of All Conversation and Knowledge". Slack had been an internal tool used for the development of Glitch. The company raised $42.75 million in April 2014. In October 2014, the company raised $120 million in venture capital with a $1.2 billion valuation led by Kleiner Perkins and GV.

  4. E-ZPass - Wikipedia

    en.wikipedia.org/wiki/E-ZPass

    Website. www .e-zpassiag .com. E-ZPass is an electronic toll collection system used on toll roads, toll bridges, and toll tunnels in the Eastern United States, Midwestern United States, and Southern United States. The E-ZPass Interagency Group (IAG) consists of member agencies in several states, which use the same technology and allow travelers ...

  5. Employee resource group - Wikipedia

    en.wikipedia.org/wiki/Employee_resource_group

    Employee resource group. Employee resource groups (also known as ERGs, affinity groups, business network groups, or business resource groups [1]) are groups of employees who join in their workplace based on shared characteristics or life experiences. [2] ERGs are generally based on providing support, enhancing career development, and ...

  6. Redo log - Wikipedia

    en.wikipedia.org/wiki/Redo_log

    In the Oracle RDBMS environment, redo logs comprise files in a proprietary format which log a history of all changes made to the database. Each redo log file consists of redo records. A redo record, also called a redo entry, holds a group of change vectors, each of which describes or represents a change made to a single block in the database.

  7. Maryland Transit Administration - Wikipedia

    en.wikipedia.org/wiki/Maryland_Transit...

    1⁄2 in ( 1,435 mm) standard gauge. The Maryland Transit Administration ( MTA) is a state-operated mass transit administration in Maryland, and is part of the Maryland Department of Transportation. The MTA operates a comprehensive transit system throughout the Washington-Baltimore metropolitan area. There are 80 bus lines serving the Baltimore ...

  8. Logarithmic integral function - Wikipedia

    en.wikipedia.org/wiki/Logarithmic_integral_function

    Logarithmic integral function. In mathematics, the logarithmic integral function or integral logarithm li ( x) is a special function. It is relevant in problems of physics and has number theoretic significance. In particular, according to the prime number theorem, it is a very good approximation to the prime-counting function, which is defined ...

  9. Philippines - Wikipedia

    en.wikipedia.org/wiki/Philippines

    The Philippines is an archipelago of about 7,641 islands, [202] [203] covering a total area (including inland bodies of water) of about 300,000 square kilometers (115,831 sq mi).