I recall hearing that most type is about 50% redundant if the only consideration is legibility. If so, I’m interested in why mi-type, or something like it, never caught on. If the entire history of print was reduced by half the material costs—assuming it was just a legible— this would have been significant in labor/ cost/ carbon reduction.
Quite likely the most useful, yet infrequently available typographical symbol from the 1960’s. The interrobang. What‽ You can find it in Special Characters of Helvetica, Courier, Palatino, and a few others.
From: Ferguson, Adam. The History of the Progress and Termination of the Roman Republic. Edinburgh: Printed for Bell & Bradfute; and sold by Longman, Rees, Hurst, and Orme, London. 1805.
A well placed long ‘s’ often gives me a chuckle. My all time favorite was a scientific text that kept mentioning sucking on a pipette.