I've been wondering what L means in the R computing context, and was
wondering if someone could point me to a reference where I could read about
it, or tell me what it's called so that I can search for it myself.  (L by
itself is a little too general for a search term).

I encounter it in strange places, most recently in the "save" documentation.

save(..., list = character(0L),
>      file = stop("'file' must be specified"),
>      ascii = FALSE, version = NULL, envir = parent.frame(),
>      compress = !ascii, compression_level,
>      eval.promises = TRUE, precheck = TRUE)
>

I remember that you can also find it when you step inside an apply function:

> sapply(1:10, function(x)browser())
> Called from: FUN(1:10[[1L]], ...)
>

I apologize for being vague, it's just something that I would like to
understand about the R language (the R word).

Thank you!

Gene

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