Arimo
Sphinx of black quartz, judge my vow
Drawn for Monotype in 1982 by Robin Nicholas and Patricia Saunders, and on essentially every computer sold since.
Widths, before shapes. Arial is what documents are laid out in, so a substitute that is not metric-compatible will reflow a file and change its page count even when it looks close.
One entry, because one is the honest answer. A face is listed here only if the substitution would survive a designer looking at both.
Sphinx of black quartz, judge my vow