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The cursor for the Windows Command Prompt (appearing as an underscore at the end of the line). In most command-line interfaces or text editors, the text cursor, also known as a caret, [4] is an underscore, a solid rectangle, or a vertical line, which may be flashing or steady, indicating where text will be placed when entered (the insertion point).
Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and can later be made visible by some means, such as heat or ultraviolet light.
The supernatural ability to turn invisible has become a popular superpower in superhero media, one of the most notable users being Marvel Comics' Invisible Woman, a member of the Fantastic Four. The power of invisibility is occasionally linked to the ability to create force fields, as seen with Invisible Woman and Disney Pixar's Violet Parr.