Quick tip if you write a lot rmarkdown documents and you want to add abbreviations add the folling bit to the top. Its auto sorted too.
library(tidyverse)
tibble::tribble(
~abbreviation, ~meaning,
"ZZA", "Ze Zoom Abbreviation",
"tribble", "a row wise tibble"
) %>%
arrange(abbreviation) %>%
knitr::kable(caption = "abbreviations")