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2. Virtual number - Wikipedia

   en.wikipedia.org/wiki/Virtual_number

   A virtual number, also known as direct inward dialing ( DID) or access numbers, is a telephone number without a directly associated telephone line. Usually, these numbers are programmed to forward incoming calls to one of the pre-set telephone numbers, chosen by the client: fixed, mobile or VoIP.

3. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the country, AT&T Mobility, T-Mobile US, and Verizon. [1] [2] In 2016, MVNOs across the nation such as Metro PCS , Boost Mobile , Cricket Wireless , and Tracfone brands served about 36 million ...

4. Online university - Wikipedia

   en.wikipedia.org/wiki/Online_university

   A virtual university (or online university) provides higher education programs through electronic media, typically the Internet. Some are bricks-and-mortar institutions that provide online learning as part of their extended university courses while others solely offer online courses. They are regarded as a form of distance education.

5. Virtual particle - Wikipedia

   en.wikipedia.org/wiki/Virtual_particle

   A virtual particle is a theoretical transient particle that exhibits some of the characteristics of an ordinary particle, while having its existence limited by the uncertainty principle, which allows the virtual particles to spontaneously emerge from vacuum at short time and space ranges.

6. Page table - Wikipedia

   en.wikipedia.org/wiki/Page_table

   At its core is a fixed-size table with the number of rows equal to the number of frames in memory. If there are 4,000 frames, the inverted page table has 4,000 rows. For each row there is an entry for the virtual page number (VPN), the physical page number (not the physical address), some other data and a means for creating a collision chain ...

7. Controlled payment number - Wikipedia

   en.wikipedia.org/wiki/Controlled_payment_number

   Virtual credit card. A virtual credit card (VCC) is a virtual credit card number (VCN) typically used for online purchases, and often for single-use transactions. Virtual credit card numbers are not associated with a physical card, and consequently cannot be used for in-person transactions.