The month.abb is an inbuilt R constant.
month.abb in R
The month.abb is the three-letter abbreviations for the English month names. Sometimes date vector for months is recorded in numeric form, and it becomes difficult to treat or visualize it as a date vector.
For example, if the vector for months has numbers 1 that represents January, 2 that represents February, and so on, then it is considered as a numeric vector instead of the vector to represent the month.
Example
month.abb
Output
[1] "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"
Changing abbreviations to numerical month values
If you have a vector of integers consisting of the number of the month, then you can use it to get the three letters abbreviation of the month name by doing the following.
mnth <- c(12, 10, 8, 6, 4, 2)
month.abb[mnth]
Output
[1] "Dec" "Oct" "Aug" "Jun" "Apr" "Feb"
That is it for the month.abb constant.

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