I had a discussion with friends on this issue on both G+ (https://plus.google.com/u/0/+DanielStenberg/posts/Jwa6Q8Pw6yY) and Facebook over this, and I'm afraid that the results disagree with you.

Most people seem to say that 'dash' is the preferred word for this symbol and the word they mostly use for this.

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** [bugs:#1297] -u : --negotiate do not work when -K is used**
**Status:** open-confirmed
**Created:** Wed Nov 06, 2013 03:19 PM UTC by Michael Osipov
**Last Updated:** Thu Nov 07, 2013 02:24 PM UTC
**Owner:** Daniel Stenberg
I do use:
curl 7.33.0 (x86_64-unknown-linux-gnu) libcurl/7.33.0 OpenSSL/1.0.0 zlib/1.2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp
Features: GSS-Negotiate IPv6 Largefile NTLM NTLM_WB SSL libz
Invoking a URL with:
$ curl -i -L -o /dev/null -k --negotiate -u : $URL
works as expected. Negotiate auth is performed. When I transform this to a param file and pass with -K
$  curl -K params.txt
Warning: params.txt:6: warning: '-u' requires parameter
Interestingly, if I set -u foo:bar in the param file, the download works as expected.
The -u in the params file should behave same as in the first example.
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