The following symbols are available for marking points - the centre of the symbol usually marks the point. Character size and boldness also applies to symbols.
0 open square 16 filled square
1 dot 17 filled circle
2 cross 18 filled five-point star
3 asterisk 19 larger open square
4 open circle 20 very small open circle
5 diagonal cross 21 ^
6 open square 22 |
7 open triangle 23 open circles of
8 open circle with cross 24 increasing size
9 open circle with dot 25 |
10 open 'pin-cushion' 26 v
11 open diamond 27 very large open circle
12 open five-point star 28 left arrow
13 filled triangle 29 right arrow
14 open cross 30 up arrow
15 open six-point star 31 down arrow
32-127 the corresponding ASCII character