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  2. LeetCode - Wikipedia

    en.wikipedia.org/wiki/LeetCode

    LeetCode is an online platform for coding interview preparation. The service provides coding and algorithmic problems intended for users to practice coding. LeetCode has gained popularity among job seekers and coding enthusiasts as a resource for technical interviews and coding competitions.

  3. List of FTP server return codes - Wikipedia

    en.wikipedia.org/.../List_of_FTP_server_return_codes

    List of FTP server return codes. FTP server return codes always have three digits, and each digit has a special meaning. [1] The first digit denotes whether the response is good, bad or incomplete: Range. Purpose. 1xx. Positive Preliminary reply. The requested action is being initiated; expect another reply before proceeding with a new command ...

  4. Countersign (military) - Wikipedia

    en.wikipedia.org/wiki/Countersign_(military)

    Countersign (military) In military terminology, a countersign is a sign, word, or any other signal previously agreed upon and required to be exchanged between a picket or guard and anybody approaching his or her post. The term usually encompasses both the sign given by the approaching party as well as the sentry's reply.

  5. Plus and minus signs - Wikipedia

    en.wikipedia.org/wiki/Plus_and_minus_signs

    The plus sign ( +) and the minus sign ( −) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition, which results in a sum, while − represents subtraction, resulting in a difference. [1] Their use has been extended to many other meanings, more or less analogous.

  6. Code-division multiple access - Wikipedia

    en.wikipedia.org/wiki/Code-division_multiple_access

    Multiplexing. Code-division multiple access ( CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth ).

  7. Indian rupee sign - Wikipedia

    en.wikipedia.org/wiki/Indian_rupee_sign

    The Indian rupee sign ₹ is the currency symbol for the Indian rupee ( ISO 4217: INR), the official currency of India. Designed by D. Udaya Kumar, it was presented to the public by the Government of India on 15 July 2010, [1] following its selection through an open competition among Indian residents. [2] [3] Before its adoption, the most ...

  8. Duress code - Wikipedia

    en.wikipedia.org/wiki/Duress_code

    Duress code. A duress code is a covert distress signal used by an individual who is being coerced by one or more hostile persons. It is used to warn others that they are being forced to do something against their will. Typically, the warning is given via some innocuous signal embedded in normal communication, such as a code-word or phrase ...

  9. 2-Step Verification with a Security Key - AOL Help

    help.aol.com/articles/2-step-verification-with-a...

    2-Step Verification with a Security Key. A security key is a physical device that gets uniquely associated with your AOL account after you enable it. Each time you sign in with your password, you'll be prompted to approve access to your account using your key. This prevents anyone who doesn't have your security key device from gaining access to ...