Unicode in R
You can easily display special unicode characters in R if you know the associated four-digit alphanumeric code:
# General format given XXXX is 4-digit alphanumeric code
# \UXXXX
# Common examples
# Unicode for less than or equal sign
print( "\U2264" )
# Unicode for greater than or equal sign
print( "\U2265" )
# Unicode for not-equal sign
print( "\U2260" )
# Unicode for plus-minus sign
print( "\U00B1" )
# Unicode for square-root sign
print( "\U221A" )
# Unicode for tilde operator
print( "\U223C" )