3.4 Data types in tibbles

When you display a tibble, note that there is a 3 or 4-letter abbreviation under each column name that describes the type of each variable:

Abbreviation Description
int integers
dbl doubles (or real numbers)
chr character vectors (or strings)
lgl logicals (TRUE or FALSE)
fctr factors (categorical variables)
date dates
dttm date-time (a date + a time)