Lotus 123's slash commands were extremely handy. To the point where Microsoft was forced to copy them when Excel first came out to ease transition of users. There's a ton of older references on the web on how to use them. See https://www.isric.org/sites/default/files/isric_report_1990_... for a reproduction of 123's main menus. The sequences become muscle memory really fast.

Huh. First time I've ever seen "@" referred to as the "monkeytail sign" (pg 15)

In English seeing it referred to as "monkeytail" looks weird, but in my native language Dutch it's often referred to as "apenstaart" or "apenstaartje" which means "monkeytail" resp. "little monkeytail". Though more and more often it's referred to as the English "at".

(Which, as I come to notice now, is almost exactly what the Wikipedia article in the sibling comment says)

Globally it has a variety of often charming interpretations:

https://en.wikipedia.org/wiki/At_sign#Names_in_other_languag...

> snabel-a, the Swedish/Danish name (which means 'trunk A', as in 'elephant's trunk')

This one is my favorite but I am biased because I grew up to this name. Always found it a funny name though.