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)