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After-the-dot-in-a-file-name, it is called extension.
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This naming convention comes from Unix-like operating systems (such as Linux or OSX) where it means a hidden file or directory. It works anywhere, but its primary use is to hide configuration files in your home directory (i.e. ~/. cache/ or ~/. plan) They are frequently called dot files.
In Unix-like operating systems, any file or folder that starts with a dot character (for example, /home/user/. config), commonly called a dot file or dotfile, is to be treated as hidden – that is, the ls command does not display them unless the -a or -A flags ( ls -a or ls -A ) are used.
A dot at the beginning of a filename hides the file in common file managers and for common shell programs. The reason is historical, when ls hid the special directories . and .. by hiding everything which starts with a period.
Windows file names have two parts; the file's name, then a period followed by the extension (suffix). The extension is a three- or four-letter abbreviation that signifies the file type. For example, in letter. docx the filename is letter and the extension is docx.
It's called the basename. In fact, there's a unix/linux command for it:
basename - strip directory and suffix from filenames
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The "base name," "basename," "primary name," "filename," "file name," or the "file."
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