Random comments:
I suggest omitting the references to gerunds in all but } and @.
("insert verbs from gerund m cyclically", etc.)
Someone who knows how to use gerunds in the other places don't
need them on the reference card; someone who doesn't isn't
going to be helped much by having them on the reference card.
The description for the monad #: is misleading. Likewise the
description for a&#.^:_1 y .
There is insufficient coverage of rank ("). For example,
the description of { gives various ways of using { ,
but does not have one of the most common uses, which is
3 2 2 {"1 A to index columns of an array.
Some operators may need more coverage. e.g. for / it says:
u/ y Insert insert u between elements of y and evaluate
m/ y InsertGerund insert verbs from gerund m cyclically
I would omit the InsertGerund thing, and instead include
at least +/ and +/"1 .
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