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There are other pages with same name:

- (Unix)

[1] cut (2024-06-23T02:58:10.000Z) https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cut.html#tag_20_28_05

if a file operand is '-', the standard input shall be used.

[2] tar (2024-06-23T03:00:59.000Z) https://pubs.opengroup.org/onlinepubs/007908799/xcu/tar.html

If the name of the file is -, tar writes to the standard output or reads from the standard input, whichever is appropriate.

[3] 関連: -- (Unix)