. | Full stop, period, dot | names, S3 method separation | |
, | Comma | sepearating function arguments | |
: | Colon | sequences, namespace resolution | |
; | Semicolon | force end of instruction | |
+ | Plus sign | addition | |
- | Hyphen, minus, frequently just dash | subtraction | |
_ | Underscore | object names | |
= | Equals sign | argument definition, equation | |
! | Exclamation mark | logical not operator | |
? | Question mark | accessing help files | |
* | Asterisk | multiplication, power | |
/ | (Forward) slash | division, paths | |
\ | Backslash | escape characters | |
% | Percent sign | modulus, match operator | |
& | Ampersand | logical AND operator | |
$ | Dollar sign | list element access, S3 | |
@ | At sign | access S4 slots | |
# | Number sign, pound, hash | comments | |
( ) | Open and close (round) parentheses (parens) | functions, operation precedence | |
[ ] | Open and close (square) brackets | subsetting | |
{ } | Open and close (curly) braces | block definition | |
< > | Left and right (angled) chevrons | assignment, comparisons | |
' | Single quotation mark, single quote | in text | |
" | Double quotation mark, double quote | character values | |
~ | Tilde | formula | |
` | Backtick, backquote | symbols | |
| | Vertical bar, pipe | logical OR operator | |